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How many usable host addresses does the subnet provide?


A network technician has isolated a problem at the transport layer of the OSI model. Which question would provide further information about the problem?

Do you have a firewall that is configured on your PC?

Refer to the exhibit. A network administrator is in the process of sending a preconfigured text file to a router. When the administrator pastes the configuration into the router, an error message appears. What is the problem with the IP addressing scheme?

The IP address on FastEthernet0/0 overlaps with the IP on Serial0/1.

A user can access any web page on the Internet but cannot access e-mail. What troubleshooting method would be most efficient for troubleshooting this issue?


Refer to the exhibit. What are two possible causes for the interface status? (Choose two.)

The encapsulation type is mismatched.
Keepalive messages are not being received.

Refer to the exhibit. Host H1 on the LAN is not able to access the FTP server across the Internet. Which two configuration statements are causing this problem? (Choose two.)

The NAT command on the Fa0/0 interface is applied in the wrong direction.
The NAT command on the S0/0/0 interface is applied in the wrong direction.

Which two conditions identify issues that are confined to Layer 1? (Choose two.)

cables that exceed maximum length
poor termination of cables

A network administrator is upgrading a Cisco 1841 router by adding a WIC-2T module card. Which show command can the administrator use to verify that the module is correctly recognized by the router?

show version

Hosts on two separate subnets cannot communicate. The network administrator suspects a missing route in one of the routing tables. Which three commands can be used to help troubleshoot Layer 3 connectivity issues? (Choose three.)

show ip route

Refer to the exhibit. Which statement is true regarding the IP address configuration?

Interface Fa0/0 and NetworkB can be in the same subnet.

A network administrator plugs a new PC into a switch port. The LED for that port changes to solid green. What statement best describes the current status of the port?

The port is operational and ready to transmit packets.

Refer to the exhibit. Which three statements are true about the output of the show ip interface brief command? (Choose three.)

FastEthernet0/0 is functioning correctly.
The shutdown command has been applied on Serial0/0.
FastEthernet0/1 is experiencing a Layer 2 network problem.

Refer to the exhibit. Users on the network are unable to access anyone on the network. What two problems exist in the network? (Choose two.)

R2 is using a different version of RIP.
R2 has a missing network statement.

Refer to the exhibit. The PC is trying to ping router B at, but it fails. What is the problem?

The default gateway on the PC should be

An administrator is creating a lab to simulate a WAN connection. During the setup,the administrator notices that there are different encapsulation types on each end of the serial connection. At what layer of the OSI model is this problem occurring?

Layer 2

Refer to the exhibit. A router initially boots up to ROMMON mode. The administrator enters the dir flash: command and sees the output that is shown. What should the administrator do next?

Boot the router using the reset command in ROMMON.

A PC is able to reach devices that are located both inside and outside the network. However, when trying to reach an FTP server that is located on the same subnet, the PC fails to make a connection. The administrator has several other PCs
that are located in the same subnet try a connection to the FTP server and they are successful. Which troubleshooting tool can be used to determine the problem between the PC and the FTP server?

protocol analyzer

Refer to the exhibit. Which IP address is misconfigured and is causing connectivity problems between hosts and servers?


Which problem is associated with Layer 4 of the OSI model?

A firewall is blocking Telnet packets to a host.

A user is having trouble accessing the Internet. A network administrator begins by verifying that the IP address of the PC is correctly configured. Next the administrator pings the default gateway. Based on this information, what type of troubleshooting method is the administrator employing?


An ISP help desk technician receives a call from a customer who reports that no one at their business can reach any websites or get their e-mail. After testing the communication line and finding everything fine, the technician instructs the customer to run nslookup from the command prompt. What does the technician suspect is causing the customer's problem?

failure of DNS to resolve names to IP addresses

Cable tester

Detects broken wires, crossed-over wiring, shorted connections, and improperly paired connections.

Digital Multimeter

Checks power-supply voltage levels and verifies that network devices are receiving power.

Network Analyzer

Identifies devices producing the most network traffic, analyzes network traffic by protocol, and view interface details.

Network Management System

Graphically displays a physical view of network devices and can locate the source of a failed device.

Protocol Analyzer

Filters traffic that meets certain criteria so that all traffic between two devices can be captured.

A network administrator is troubleshooting connectivity issues with a router and finds that the S0/0/0 interface IP address has been improperly configured. At what layer of the OSI model is the problem occurring?

Layer 3

Cable type for connection.
Host to Switch,


Cable type for connection.
Hub to Switch


Cable type for connection.
Router to Switch,


Cable type for connection.
Switch to Switch


Cable type for connection.
Router to Host


Cable type for connection.
Hub to Router


Choose the Layer for the network situation
Excessive Broadcasts

Layer 2

Choose the Layer for the network situation
Encapsulated error

Layer 2

Choose the Layer for the network situation
Loose cable connection

Layer 1

Choose the Layer for the network situation
Fluctuating Power Supply

Layer 1

Choose the Layer for the network situation
Serial 0/0/0 is up, protocol is down

Layer 2

Choose the Layer for the network situation
Misconfigured NIC

Layer 2

Choose the Layer for the network situation
Incorrect cable type

Layer 1

Choose the Layer for the network situation
Damaged serial interface connector

Layer 1

A network administrator is troubleshooting the connectivity between the headquarters and the branch office. Which important troubleshooting information can the administrator get from the output of the show interface serial 0/0/0 command?

Encapsulated type

Which interface status indicates a high error rate?

serial 0/0/0 is up, line protocol is down (disabled).

Host on the LAN are able to communicate with hosts on the same LAN, but are unable to connect outside the network. What is the possible problem?

The default gateway address is on a different network.

What can be concluded from the output.

R1 sent a RIP broadcast on Fa0/0 that advertises two networks.
R1 has recieved updates from one router at source address

What are the results of the following commands issued on R1?
interface fa0/0
ip helper-address

DHCP requests are forwareded to

PC's on different networks can ping each other but not telnet.

The packets were blocked by a firewall.

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