32 terms

Cisco Chapter 5 Exam

Introduction to Networks (Version 5.0) - ITN Chapter 5 Exam
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What is the purpose of the preamble in an Ethernet frame?
is used for timing synchronization
A Layer 2 switch is used to switch incoming frames from a 1000BASE-T port to a port connected to a 100Base-T network. Which method of memory buffering would work best for this task?
shared memory buffering
What are two potential network problems that can result from ARP operation? (Choose two.)
1.On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays.
2.Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic.
Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)
1.Logical link control is implemented in software.
2.The data link layer uses LLC to communicate with the upper layers of the protocol suite.
Which two statements describe a fixed configuration Ethernet switch? (Choose two.)
1.A fixed configuration switch may be stackable.
2.The number of ports on the switch cannot be increased.
Refer to the exhibit. PC1 issues an ARP request because it needs to send a packet to PC2. In this scenario, what will happen next?​
PC2 will send an ARP reply with its MAC address.
Open the PT Activity. Perform the tasks in the activity instruction and then answer the question.
What destination address will PC1 include in the destination address field of the Ethernet frame that it sends to PC2?
0030.a3e5.0401
Which address or combination of addresses does a Layer 3 switch use to make forwarding decisions?
MAC and IP addresses
cut-through
1. has low latency
2. may forward runt frames
3. begins forwarding when the destination address is received
store-and-forward
1. always stores the entire frame
2. checks the CRC before forwarding
3. checks the frame length before forwarding
When would a switch record multiple entries for a single switch port in its MAC address table?
when another switch is connected to the switch port
Refer to the exhibit. The exhibit shows a small switched network and the contents of the MAC address table of the switch. PC1 has sent a frame addressed to PC3. What will the switch do with the frame?
The switch will forward the frame to all ports except port 4.
What is the Layer 2 multicast MAC address that corresponds to the Layer 3 IPv4 multicast address 224.139.34.56?
01-00-5E-0B-22-38
(The multicast MAC address is a special value that begins with 01-00-5E in hexadecimal. The value ends by converting the lower 23 bits of the IP multicast group address into the remaining 6 hexadecimal characters of the Ethernet address. The remaining bit in the MAC address is always a "0".
In this case:
224 (decimal) => 01-00-5E
139 (decimal) = 10001011 (binary) ==> (23 bits) = 0001011 (binary) = 0B (hexadecimal)
34 (decimal) = 00100010 (binary) = 22 (hexadecimal)
56 (decimal) = 00111000 (binary) = 38 (hexadecimal)
Putting all together: 01:00:5E:0B:22:38)
A network administrator is connecting two modern switches using a straight-through cable. The switches are new and have never been configured. Which three statements are correct about the final result of the connection? (Choose three.)
1.The link between the switches will work at the fastest speed that is supported by both switches.
2.The link between switches will work as full-duplex.
3.The auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable.
Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved? (Choose two.)
1.Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another.
2. Destination IP addresses in a packet header remain constant along the entire path to a target host.
What statement illustrates a drawback of the CSMA/CD access method?
Collisions can decrease network performance.
A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in its ARP cache. How will the device obtain a destination MAC address?
It will send an ARP request for the MAC address of the default gateway.
What are two features of ARP? (Choose two.)
1.If a host is ready to send a packet to a local destination device and it has the IP address but not the MAC address of the destination, it generates an ARP broadcast.
2.If a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply.
What is a characteristic of a contention-based access method?
It is a nondeterministic method.
Which statement is true about MAC addresses?
The first three bytes are used by the vendor assigned OUI.
Fill in the blank.
The binary number 0000 1010 can be expressed as ________ in hexadecimal.
0A
How does adding an Ethernet line card affect the form factor of a switch?
by expanding the port density
A network administrator issues the following commands on a Layer 3 switch:

DLS1(config)# interface f0/3
DLS1(config-if)# no switchport
DLS1(config-if)# ip address 172.16.0.1 255.255.255.0
DLS1(config-if)# no shutdown
DLS1(config-if)# end
What is the administrator configuring?
a routed port
Start Frame Delimiter
Field 2
Source MAD address
Field 4
Encapsulated Data
Field 6
Flag
x
Preamble
Beginning of frame - Field 1
Destination MAC Address
Field 3
Length/Type
Field 5
Frame Check Sequence
End of frame - Field 7
Session ID
x
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