Cisco

Created by phamt78 

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What is the default configuration register value for a cisco router?

0x2102, which tells the router to load the IOS from flash memory as well as to load the configuration from NVRAM (startup-config).

What are the four step in the router boot sequence?

1. Power on self test (POST). The POST test the hardware to verify that all componets of the device are operational and present. The POST is stored in and run from ROM.
2. The bootstrap then looks for and loads the Cisco IOS software. Bootstarp is a program in rom. Cisco router looks for IOS by default in flash memory (EEPROM).
3. The IOS software looks for a valid configuration file store in NVRAM (startup-config).
4. If a startup-config is in NVRAM the router will copy the file and place it in RAM and call the file running-config. If a file is not found in NVRAM, the router will broadcast out any interface that detects carrier detect for a TFTP host looking for a configuration, and whe that fails it will start the setup mode configuration process.

What command shows you the current IOS image running?

show version

What is the frequency range of 802.11a standard?

5GHz

What is frequency range of 802.11b standard?

2.4GHz

What is the frequency range 802.11g standard?

2.4GHz

How man non-overlapping channels are available with 802.11a(h) standard?

23 non-overlapping channels.

How man non-overlapping channels are available with 802.11b standard?

3 non-overlapping channels.

How man non-overlapping channels are available with 802.11g standard?

3 non-overlapping channels.

What modulation technique does 802.11a (h) standard uses?

Orthogonal Frequency Division Multiplexing (OFDM) modulation.

What modulation technique does 802.11b standard uses?

Direct Sequence Spread Spectrum (DSSS) modulation.

What modulation technique does 802.11g standard uses?

Direct Sequence Spread Spectrum (DSSS) modulation. & Orthogonal Frequency Division Multiplexing (OFDM) modulation.

What is the significant change in 802.11n vs 802.11a/b/g?

802.11n build upon previous 802.11 standards by adding Multiple-Input Multiple-Output (MIMO), which employs multiple transmitters and receivers antennas to increase data throughput. 802.11n can have up to eight antennas.

What is the max data rate for the 802.11a standard?

54 Mbps

What is the max data rate for the 802.11b standard?

11 Mbps

What is the max data rate for the 802.11g standard?

54 Mbps

What is the maximum distance with maximum data rate for 802.11a?

The maximum data rate of up to 54 Mbps, but you need to be close to the access point, somewhere around 65 to 75 feet.

What is the maximum distance with maximum data rate for 802.11b?

The maximum data rate of up to 11 Mbps, and you can be around 150 feet, maybe farther, depending on condition.

What is the maximum distance with maximum data rate for 802.11g?

The maximum data rate of up to 54 Mbps, but you need to be close to the access point, somewhere around 90 to 100 feet.

What is the maximum distance running the lowest data rate for 802.11a?

lowest data rate is 6 Mbps, but it can run from a distnce of about 175 feet.

What is the maximum distance running the lowest data rate for 802.11b?

lowest data rate is 1 Mbps, but it can run from a distnce of about 350 feet.

What is the maximum distance running the lowest data rate for 802.11g?

lowest data rate is 6 Mbps, but it can run from a distnce of about 300 feet.

Cisco's Unified Wireless Solution provides a mesh solution. What device do you absolutely need to purchase to run a Cisco solution?

Controller and Access point

What is a Root Access Point (RAP)?

A access point connected to a wired network that serves as the gateway to the wired network. RAPs have a wired connection bact to a Cisco Wireless LAN Controller. They use the backhaul wireless interface to communicate with neighboring Mesh APs.

What is a Mesh Access Point (MAP)?

The Mesh APs are remote APs that are typically located on rooftops or towers and can connect up to 32 MAPs over a 5 GHz backhaul. During bootup, an access point will try to become a Root Access Point (RAP) if it's connected to the wired network. Conversely if a RAP loses its wired network connection, it will attempt to become a Mesh Access Point (MAP) and will serach for a RAP

What protocol is uses by Cisco Access point to determine the best path back to the wired network?

Adaptive Wireless Path Protocol (AWPP) - a protocol design by Cisco specifically for the wireless environment.

You are connection your access point and it is set to root. What does extended service set ID mean?

Extended service set ID means that you have more than one access point and they all are set to the same SSID and all are connected together in the same VLAN or distrubution system so users can roam.

What is the default serial encapsulation on Cisco routers?

High-Level Data-Link Control (HDLC)

What are the three PPP Data Link layer protocols?

Network Control Protocol (NCP), which defines the Network layer protocols; Link Control Protocol (LCP), a method of establishing, configuring, maintaining, and terminating the point-to-point connection; and High-Level Data-Link Control (HDLC), the MAC layer protocol that encapsulates the packets.

What is CIR in Frame Relay?

The Commited Information Rate (CIR) is the average rate, in bits per second, at which the Frame Relay switch agrees to transfer data.

What are the 3 encapsulation that CISCO supports on its serial interfaces?

HDLC, PPP, and Frame Relay.

Which command will display the CHAP authentication process as it occurs between two router in the network?

A. show chap authentication
B. show interface serial 0
C. debug ppp authentication
D. debug chap authentication

C. The command debug ppp authentication will show you the authentication proces that PPP uses between point-to-point connections.

Which Command is required for connectivity in a Frame Relay network if Inverse ARP is not operational?

A. frame relay arp
B. frame relay map
C. frame relay interface-dci
D. frame-relay lmi-type

B. If you have a router in your Frame Relay network thad does not support IARP, you must create Frame Relay maps on you router, which provide known DLCI-to-IP address mappings.

Suppose that you have a customer who has a central HQ and six branch offices. They anticipate adding six more brances in the near furture. They wish to implement a WAN technology that will allow the branches to economically connect to HQ and you have no free ports on the HQ router. Which of the following would you recommend?

A. PPP
B. HDLC
C. Frame Relay
D. ISDN

C. The key is "there are no free ports" on your router. Only Frame Relay can provide a connection to multiple locations with one interface, and in an economical manner no less.

Which of the following command options are displayed when you use the Router# show frame-relay command ? (Choose three.)

A. dlci
B. neighbors
C. lmi
D. pvc
E. map

C,D,E. The show frame-relay command provide may option, but the options available in the question are lmi, pvc, and map.

How should a router that is being used in a Frame Relay network be configured to keep split horizon issues from preventing routing updates?

A. Configure a separate subinterface for each PVC with a unique DLCI and subnet assigned to the subinterface.
B. Configure each Frame Relay circuit as a point-to-point line to support multicast and broadcast traffic.
C. Configure many subinterfaces in the same subnet.
D. Confiugre a single subinterface to establish multiple PVC connection to multiple remote router interfaces.

A. If you have a serial port confiured with multiple DLCIs connected to multiple remote sites, split horizon rules stop route updates received on an interface from being sent out the same interface. By creating subinterfaces for each PVC, you can avoid the split horizon issues when using Frame Relay.

Which encapsulation can be configured on a serial interface?

A. Ethernet
B. Token Ring
C. HDLC
D. Frame Relay
E. PPP

C, D, E. Ethernet and Token Ring are LAN techonologies and cannot be configured on a serial interface. PPP, HDLC, and Frame Relay are layer 2 WAN technologies that are typically confiugred on a serial interface.

When setting up Frame Relay for point-to-point subinterfaces, which of the following must not be configured?

A. The Frame Relay encapsulation on the physical interface
B. The local DLCI on each subinterface
C. An IP address on the physical interface
D. The subinterface type as point-to-point

C. It is very important to remember when studying the CCNA exam objectives, and when confiugring Frame Relay with point-to-point subinterfaces, that you do not put an IP address on the physical interface.

When a router is connected to a Frame Relay WAN link using a serail DTE interface, how is the clock rate determined?

A. Supplied by the CSU/DSU
B. By the far end router
C. By the clock rate command
D. By the physical layer bit stream timing

A. Clocking on a serial interface is always provided by the CSU/DSU (DCE device). However if you do not have a CSU/DSU in our nonproduction test environment, then you need to supply clocking with the clock rate command on the serial interface of the router with the DCE cable attached.

A default Frame Relay WAN is classified as what type of physical network?

A. Point-to-point
B. Broadcast multi-access
C. Non-broadcast multi-access
D. Non-broadcast multipoint

C. Frame Relay, by default, is a non-broadcast multi-access (NBMA) network, which means that broadcast, such as RIP updates, will not be forwarded across the link by default.

Which of the following encapsulates PPP frames in Ethernet frames and uses common PPP feautres like authentication, encryption, and compression?

A. PPP
B. PPoA
C. PPoE
D. TOken Ring

C. PPoE encapsulates PPP frames in Ethernet and uses common PPP features like authentication, encryption, and compression. PPPoA is used for ATM.

You need to configure a router for a Frame Relay connection to non-Cisco router. Which of the following commands will prepare the WAN interface of the router for this connection?

A. Router(config-if)#encapsulation frame-relay q933a
B. Router(config-if)#encapsulation frame-relay ansi
C. Router(config-if)#encapsulation frame-relay ietf
D. Router(config-if)#encapsulation frame-relay cisco

C. If you have a Cisco router on one side of a Frame Relay network and a non-Cisco router on the other side, you would need to use the Frame Relay encapsulation type of IETF. The default is Cisco encapsulation, which means that a Cisco router must be on both sides of the Frame Relay network.

The Acme Corporation is implementing dial-up services to enable remote-office employees to connect to the local network. The company uses multiple routed protocols, needs authentication of users connection to the network, and since some calls will be long distnace, needs call back support. Which of the following protocols is the best choice for these remote services?

A. 802.1
B. Frame Relay
C. HDLC
D. PPP
E. PAP

D. PPP is your only option, as HDLC and Frame Relay do not support these types of business requirements. PPP provides dynamic addressing, authentication using PAP or CHAP, and call-back services.

Which WAN encapsulations can be confiugred on an asynchronous serial connection? (Choose two.)

A. PPP
B. ATM
C. HDLC
D. SDLC
E. Frame Relay

A, B. Please do not freak out because ATM is an answer to this question. ATM is not covered in depth on the CCNA exam. PPP is mostly used for dial-up (async) services, but ATM could be used as well, though it typcially is not used anymore since PPP is so efficient.

Which of the following uses ATM as the Data Link layer protocol that's terminated at what's know as the DSLAM

A. DSL
B. PPPoE
C. Frame Relay
D. Dedicated T1
E. Wireless
F. POTS

A. ATM is the Data-Link layer protocol that's typically used over the DSL layer 1 connection from the CPE and terminated at what's known as the DSLAM 0 an ATM switch that contains DSL interface cards, or ATU-Cs.

Why won't the serial link between the Corp router the Remote router come up?

Corp#sh int s0/0
Serial0/0 is up, line protocol is down
Internet address is 10.0.1.1/24
Encapsulation PPP, loopback not set

Remote# sh int s0/0
Serial0/0 is up, line protocol is down
Internet address is 10.0.1.2/24
Encapsulation HDLC, loopback not set

A. The serial cable is faulty.
B. The IP addresses are not the same subnet.
C. The subnet mask are not correct.
D. The keepalive settings are not correct.
E. The layer 2 frames type are not compatible

E. This is an easy question because the Remote router is using the default HDLC serial encapsulation and the Corp router is using the PPP serail encapsulation. You should go to the Remote router and set that encapsulation to PPP or the Corp router back to the defualt HDLC.

In which of the following technologies is the term HFC used?

A. DSL
B. PPPoE
C. Frame Relay
D. Cable
E. Wireless
F. POTS

D. In a modern network, hybrid fiber-coaxial (HFC) is a telecommunication indusrtry term for a network that incorporates both optical fiber and coaxial cable to create a broadband network.

A remote site has just been connected to the cetral office. However, remote users cannot access applications at the central office. The remote router can be pinged from the central office router. Aftwer reviewing the command output shown below, which do you thing is the most likely reason for the problem?

Central# show running-config
interface Serial0
ip address 10.0.8.1 255.255.248.0
encapsulation frame-relay
frame-relay map ip 10.0.15.2 200
Router rip
Network 10.0.0.0

Remote# show running-config
interface Serial0
ip address 10.0.15.2 255.255.248.0
encapsulation frame-relay
frame-realy map ip 10.0.8.1 100
Router rip
Network 10.0.0.0

A. The Frame Relay PVC is down.
B. The IP addressing on the Central/Remote router link is incorrect.
C. Rip routing information is not being forwarded.
D. Frame Relay Inverse ARP is not properly configured.

C. Even though the IP addresses don't look correct, they are in the same subnet, so answer B is not correct. The question states that you can ping the other side, so the PVC must be up answer A can't be correct. You cannot configure IARP, so only answer C can be correct. Since a Frame Relay network is non0broadcast multi-access network by default, boradcast such as RIP updates cannot be sent across the PVC unless you use the broadcast statemetn at the end of the frame-relay map command.

Which of the following describes an industry-wide standsard suit of protocols and alogorithms that allows for secure data transmission over an IP-based network that function at the layer 3 Network layer of the OSI model?

A. HDLC
B. Cable
C. VPN
D. IPSec
E. xDSL

D. IPSec is and industry-wide standard suit of protocols and algorithms that allows for secure data transmission over an IP-based network taht funciotns at the layer 3 Network layer of the OSI model.

Which of the following describes the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols?

A. HDLC
B. Cable
C. VPN
D. IPSec
E. xDSL

C. A VPN allows the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols. A VPN can be set up across any type of link.

What function does the Frame Relay DLCI provide with respect to router A

Router A <--DLCI 100--> Flame Relay Switch <--DLCI 200-->Router B

A. Identifies the signaling standard between Router A and the frame switch
B. Identifies the circuit between RouterB and the frame switch
C. Identifies the encapsulation used between Router A and RouterB
D. Defines the signaling standard between RouterB and the frame switch.

A. DLCIs are locally significant only and define the circuit from the router to the switch only. They do not reference a remote router or DLCI. RouterA would use DLCI 100 to get to the RouterB network. Router B would use DLCI 200 to get to the Router A netwrok.

What is the command to see the encapsulation method on serial 0 of a Cisco router.

show interface serial 0

What are the commands to confiugre s0 to PPP encapsulation?

config t
int ser0
encapsulation ppp

What are the commands to configure a username of todd and password of cisco that is used on a Cisco router for PPP authenticaiton.

config t
username todd password cisco

What are the commands to enable CHAP authentication on a Cisco serial interface. (Assume PPP is the encapsulation type.)

config t
int s0
ppp authentication chap

What are the commands to configure the DLCI numbers for two serial interfaces, 0 and 1. Use 16 for s0 and 17 for s1.

config t
int s0
frame interface-dlci 16
int s1
frame interface-dlci 17

What are the commands to configure a remote office using a point-to-point subinterface. Use DLCI 16 and IP address 172.16.60.1/24

config t
int s0
encap frame
int s0.16 point-to-point
ip address 172.16.60.1 255.255.255.0
frame interface-dlci 16

What protocol would you use if you were running xDSL and needed authentication?

PPPoE

What are the three protocols specified in PPP?

HDLC, LCP and NCP

To provide security in your VPN tunnel, what protocol suite would you use?

IPsec

What are the typical three different categories of VPNs?

Remote access VPNs, site-to-site VPNs, and extranet VPNs

Which of the following is true when describing a global unicast address?

A. Packets addressed to a unicast address are delivered to a single interface.
B. These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4.
C. These are like private addresses in IPv4 in that they are not meant to be routed.
D. These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely the will have an address overlap.

B. Unlike unicast addresses, global unicast addresses are meant to be routed.

Which of the following is true when describing a unicast address?

A. Packets addressed to a unicast address are delivered to a single interface.
B. These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4.
C. These are like private addresses in IPv4 in that they are not meant to be routed.
D. These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely the will have an address overlap.

A. Packets addressed to a unicast address are delivered to a single interface. For load balancing, multiple interface can use the same address.

Which of the following is true when describing a link-local address?

A. Packets addressed to a unicast address are delivered to a single interface.
B. These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4
C. These are like private addresses in IPv44 in that they are not meant to be routed.
D. These addresses are meant for nonrouting purposes, but they are almost globablly unique so it is unlikely they will have an address overlap.

C. Link-local address are meant for throwing together a temporary LAN for meetings or a local small LAN that is not going to be routed but needs to share and access files and services locally.

Which of the following is true when describing a unique local address?

A. Packets addressed to a unicast address are delivered to a single interface.
B. These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4
C. These are like private addreses in IPv4 in that they are not meant to be routed.
D. These addresses are meant for nonrouting purpose, but they are almost globally unique so it is unlikely they will have an address overlap.

D. These addresses are meant for nonrouting purposes like link-local, but they are almost globally unique so it is unlikely they will have an address overlap. Unique local addresses were designed as a replacement for sire-local addresses.

Which of the following is true when describing a multicast address?

A. Packets addressed to a unicast address are delivered to a single interface.
B. Packets are delivered to all interfaces identified by the address. Thi is also called a one-to-many address.
C. Identifies multiple interfaces and is only delivered to one address. This address can also be called one-to-one-of-many.
D. These addresses are meant for nonrouting purpose, but they are almost globally unique so it is unlikely they will have an address overlap.

B. Packets addressed to a multicast address are delivered to all interfaces identified by the multicast address, the same as in IPv4. It is also called a one-to-many address. You can always tell a multicast address in IPv6 because multicast addresses always start with FF

Which of the following is ture when describing an anycast address?

A. Packets addressed to a unicast address are delivered to a single interface.
B. Packets are delivered to all interfaces identified by the address. Thi is also called a one-to-many address.
C. This address identifies multiple interfaces and the anycast acket is only delivered to one address. This address can also be called one-to-one-of-many
D. These addresses are meant for nonrouting purpose, but they are almost globally unique so it is unlikely they will have an address overlap.

C. Anycast addresses identify multiple interfaces, which is the same as multicast; however, the big difference is that the anycast packet is only delivered to one address, the first one it finds defined in the terms of routing distance. This address can also be called one-to-one-of-many.

You want to pin the loopback address of your local host. What will you type?

A. ping 127.0.0.1
B. ping 0.0.0.0
C. ping ::1
D. trace 0.0.::1

C. The loopback address with IPv4 is 127.0.0.1. With IPv6, that address is ::1.

What two multicast addresses does OSPFv3 use?

A. FF02::A
B. FF02::9
C. FF02::5
D. FF02::6

C, D. Adjacencies and next-hop attributes now use lonk-local addresses, and OSPFv3 still uses multicast traffic to send its updates and acknowedgments with the addresses FF02::5 for OSPF routers and FF0::6 for OSPF designated routers. These are the replacements for 224.0.0.5 and 224.0.0.6, respectively.

What multicast addresses does RIPng use?

A. FF02::A
B. FF02::9
C. FF02::5
D. FF02::6

B. RIPng uses the multicast IPV6 address of FF02::9. If you remember the multicast addresses for IPV4, the numbers at the end of each IPv6 address are the same.

What multicast addresses does EIGRPv6 use?

A. FF02::A
B. FF02::9
C. FF02::5
D. FF02::6

A. EIGRPv6's multicast address stayed very near the same. In IPv4 it was 224.0.0.10; now it is FF02::A

To enable RIPng, which of the following would you use?

A. Router1(config-if)#ipv6 ospf 10 area 0.0.0.0
B. Router1(config-if)#ipv6 rip 1 enable
C. Router1(config-if)#ipv6 router eigrp 10
D. Router1(config-rtr)#no shutdown
E. Router1(config-if)#ipv6 eigrp 10

B. It's pretty simple to enable RIPng for IPv6. You configure it right on the interface where you want RIP to run with the ipv6 router rip number command.

To enable EiGRP, which three of the following would you use?

A. Router1(config-if)#ipv6 ospf 10 area 0.0.0.0
B. Router1(config-if)#ipv6 router rip 1
C. Router1(config-if)#ipv6 router eigrp 10
D. Router1(config-rtr)#no shutdown
E. Router1(config-if)#ipv6 eigrp 10

C, D, E. Unlike RIPng and OSPFv3, you need to configure EIGRP both from global configuration mode and from interface mode, and you have to enable the command with the no shutdown command.

To enable OSPFv3, which of the following would you use?

A. Router1(config-if)#ipv6 ospf 10 area 0.0.0.0
B. Router1(config-if)#ipv6 router rip 1
C. Router1(config-if)#ipv6 router eigrp 10
D. Router1(config-rtr)#no shutdown
E. Router1(config-if)#ospf ipv6 10 area 0

A. To enable OSPFv3, you enable the protocol as with RIPng, The command string is ipv6 ospf prcess-id area area-id

What two statements about IPv6 address are true? (Choose two.)

A. Leading zeros are required
B. Two colons (::) are used to represent successive hexademical fields of zeros.
C. Tow collons (::) are used to separate fields.
D. A single interface will have multiple IPv6 addresses of different types.

B, D. In order to shorten the written length of an IPv6 address, successive fields of zero may be replace by double colons. In trying to shorten the address further, leading zeros may also be removed. Just as with IPv4, a single device's interface can have more than one address; with IPv6 there are more types of addresses and the same rule applies. There can be link-local, global unicast, and multicast addresses all assigned to the same interface.

What two statements about IPv4 and IPv6 addresses are true?

A. An IPv6 address is 32 bit long, represented in hexidecimal.
B. An IPv6 address is 128 bit long, represented in decimal.
C.An IPv4 address is 32 bit long, represented in decimal
D. An IPv6 address is 128 bits long, represented in hexidecimal.

C, D. IPv4 address are 32 bits long and are represented in decimal format. IPv6 addresses are 128 bits long and represented in hexadecimal format.

Which type of packet is addressed and delivered to only a single interface?

Unicast

Which type of address is used just like a regular public routable addrss in IPv4?

Global unicast

Which type of address is not meant to be routed?

Link-local

Which type of address is not meant to be routed to the Internet but is still globally unique?

Unique local (used to be called site-local)

Which type of address is meant to be delivered to multiple interfaces?

Multicast

Which type of address identifies multiple interfaces, but packets are delivered only to the first address it finds.?

Anycast

Which routing protocol uses multicast address FF02::5?

OSPF

IPv4 had a loopback address of 127.0.0.1 . What is the IPv6 loopback address?

::1

What does a link-local address always start with?

FE80::

What does a unque local unicast range start with?

FC00::

In IPv6 What is the global unicast address range?

2000::/3

In IPv6 what is the unique local unicast range.

FC00::/7

In IPv6 what is the link-local unicast range?

FF80::/10

In IPv6 what is the multicast range?

FF00::/8

In IPv6 what is the resereved ip range for examples and documentation?

3FFF::FFFF::/32
2001:0DB8::/32

Inn IPv6 what ip rage is used with 6to4; the structure that allows IPv6 packets to be transmitted over an IPv4 network without the need to configure explicit tunnels.

2002::/16

What type of address translation can use only one address to allow thoussands of hosts to be translated globally?

Port Address Translation (PAT), also called NAT Overload.

What commnad can you use to show the NAT translation as the occur on your router?

debug ip nat.

What command will show you the translation table?

show ip nat translations.

How much memory does each NAT mapping use (approximately)?

160 bytes of memory.

Why would you use the ip nat translation max-entries command?

In the rare case where the entries must be limited for either performance or policy reasons.

Which command can be used for troubleshooting and displays a summary of the NAT configuration as well as count of active translation types and hits to an existing mapping.

show ip nat statistics.

What commands must be used on your router interfaces before NAT will translate addresses?

The ip nat inside and ip nat outside commands

In the following output, what type of NAT is being used?

ip nat pool todd-nat 170.168.10.10 170.168.10.20 netmask 255.255.255.0

Dynamic NAT

Instead of the netmask command, you can use the _______ statement.

prefix-length

What command will clear all your NAT entries from the translation table?

clear ip nat translations *

Which of the following are disadvantages of using NAT? (Choose three.)

A. Translation introduces switching path delays.
B. Conserves legally registered addresses.
C. Causes loss of end-to-end IP traceability.
D. Increases flexibility when connecting to the Internet.
E. Certain applications will not function with NAT enabled.
F. Reduces address overlap occurrence.

A, C, E. NAT is not perfect and cause some issues in some networks, but most networks work just fine. NAT can cause delays and troubleshooting problems, and some applications just won't work.

Which of the following are advantages of using NAT? (Choose three.)

A. Translation introduces switching path delays.
B. Conserves legally registered addresses.
C. Causes loss of end-to-end IP traceability.
D. Increases flexibility when connecting to the Internet.
E. Certain applications will not function with NAT enabled.
F. Reduces address overlap occurrence.

B, D, F. NAT is not perfect, but there are some advantages. It conserves global addresses, which allow us to add millions of hosts to the Internet without "real" IP addresses. This provides flexibility in our corporate networks. NAT can also allow you to use the same subnet more than once in the same network without overlapping networks.

Which command will allow you to see real-time translation on your router?

A. show ip nat translations
B. show ip nat statistics
C. debug ip nat
D. clear ip nat translations *

C. The command debug ip nat will show you in real time the translation occurring on your router.

Which command will clear all the translation active on your router?

A. show ip nat translations
B. show ip nat statistics
C. debug ip nat
D. clear ip nat translations *

D. the command clear ip nat translation * will clear all the active NAT entries in your translation table.

Which command will show you the summary of the NAT configurations?

A. show ip nat translations
B. show ip nat statistics
C. debug ip nat
D. clear ip nat trnslations *

B. The show ip nat statistics command displays a summary of the NAT configuration as well as counts of active translation types, hits to an existing mapping, misses (causing an attempt to create a mapping), and expired translations.

Which command will create a dynamic pool name Todd that will provide you with 30 global addrsses?

A. ip nat pool Todd 171.16.10.65 171.16.10.94 net 255.255.2255.240
B. ip nat pool Todd 171.16.10.65 171.16.10.94 net 255.255.255.224
C. ip nat pool todd 171.16.10.65 171.16.10.94 net 255.255.255.224
D. ip nat pool Todd 171.16.10.1 171.16.10.254 net 255.255.255.0

B. The command ip nat pool name createes the pool that hosts can use to get onto the global Internet. What makes answer B correct is that the range 171.16.10.65 through 171.16.10.94 includes 30 hosts, but the mask has to match 30 hosts as well, and that mask is 255.255.255.224. Answer C is wrong becuase the pool name has a lower case "T" in the pool name. Pool name's are case sensitive.

Which are considered the three methods of NAT?

A. Static
B. IP NAT pool
C. Dynamic
D. Nat double-translation
E. Overload

A, C, E. YOu can configure NAT three ways on a Cisco router: static, dynamic, and NAT Overload (PAT).

When creating a pool of global addrsses, which of the following can be used instead of the netmask command?

A. / (slash notiation)
B. prefix-length
C. no mask
D. block-size

B. Instead of the netmask command, you can use the "prefix-length length" statement.

Which of the following would be a good starting point for troubleshooting if your router is not translating?

A. Reboot.
B. Call Cisco.
C. Check your interfaces for the correct configuration.
D. Run the debug all command.

C. IN order for NAT to provide translation services, you must have ip nat inside and ip nat outside configured on your router's interfaces.

Which o fthe following would be good reasons to run NAT? (Choose three.)

A. you need to connect to the Internet and your hosts don't have globally unique IP addresses.
B. You change to a new ISP that requires you to renumber your network.
C. You don't want any host connecting to the Internet.
D. You requrie two intranets with duplicate addresses to merge.

A, B, D. The most popular use of NAT is if you want to connect to the Internect and you don't want hosts to have global (real) IP addresses, but answeres B and D are correct as well.

Which of the following is considered to be the address after translation?

A. Inside local
B. Outside local
C. Inside global
D. Outside global

C. The host on the private network after translation is considered to be an inside global host.

Which of the following is considered to be the address before translation?

A. Inside local
B. Outside local
C. Inside global
D. Outside global

A. The host on the privae network before translation is considered to be an inside local host.

Which of the following is considered to be the destination host before translation?

A. Inside local
B. Outside local
C. Inside global
D. Outside global

B. The host on the global network before translation is considered to be an outsid local host

Which of the following is considered to be the outside destination host after translation?

A. Inside local
B. Outside local
C. Inside global
D. Outside global

D. The host on the global network after translation is considred to be an outside global host.

Which command would you place on interface on a private network?

A. ip nat inside
B. ip nat outside
C. ip outside global
D. ip inside local

A. As in access-lists, you must configure your interfaces before NAT will provide any translations. On the inside networks you would use the command ip nat inside. On the outside interface, you will use the command ip nat outside.

Which command would you place on interface connected to the Internet?

A. ip nat inside
B. ip nat outside
C. ip outside global
D. ip inside local

B. As in access-lists, you must configure your interfaces before NAT will provide any translations. On the inside networks you would use the command ip nat inside. On the outside interface, you will use the command ip nat outside.

Pat addressTranslation is also termed what?

A. NAT Fast
B. NAT Static
C. NAT Overloading Static
D. Overloading Static

C. Another term for port address translation is NAT Overload because that is the command used to enable port address translation.

Which command will show you all the translation active on your router?

A. show ip nat translations
B. show ip nat statistics
C. debug ip nat
D. clear ip nat translations *

A. The show ip nat translation will show you the translation table containing all the active NAT entries.

Which of the following is an example of standard IP access list?

A. access-list 110 permit host 1.1.1.1
B. access-list 1 deny 172.16.10.1 0.0.0.0
C. access-list 1 permit 172.16.10.1 255.255.0.0
D. access-list standard 1.1.1.1

B. Standard Ip access list use the number 1-99 and 1300-1999 and filter based on source IP address only. Option C is incorrect because the mask must be in wildcard format.

You need to create an access list that will prevent hosts in the network range of 192.168.160.0 to 192.168.191.0. Which of the following lists will you use?

A. access-llist 10 deny 192.168.160.0 255.255.224.0
B. access-llist 10 deny 192.168.160.0 0.0.191.255
C. access-list 10 deny 192.168.160.0 0.0.31.255
D. access-list 10 deny 192.168.0.0 0.0.31.255

C. The range of 192.168.160.0 to 192.168.191.0 is a block size of 32. The network address is 192.168.160.0 and the mask would be 255.255.224.0, which for an access list must be wildcard format of 0.0.32.255. The 31 is used for a block size of 32. The wildccard is always one less than the block size.

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