CCNA 3 Module 4 V3.1 Answers

1. Which statements are true concerning the shared memory buffering used by an Ethernet switch? (Choose two.)

Frames are processed through a single queue.

All frames are placed in a common memory buffer.

Frames are placed in a queue for the destination port.

A port with a full memory buffer can cause frames for available ports to be delayed.

Each switch port is statically assigned a buffer of equal size.

 

2. What are the functions of routers? (Choose three.)

improving network performance by increasing latency by twenty to thirty percent

segmenting broadcast domains

forwarding packets based on destination network layer addresses

segmenting collision domains

forwarding packets as soon as the destination MAC address is read

developing routing table entries based on source IP addresses

 

3. What are the functions of a Layer 2 Ethernet switch? (Choose three.)

preventing broadcasts

increasing available bandwidth per user

decreasing the size of collision domains

isolating traffic among segments

routing traffic between different networks

decreasing the number of broadcast domains

 

4. Why does a switch have higher throughput compared to a bridge?

Switching occurs in software.

Switching occurs in hardware.

Switches create multiple broadcast domains.

Switches segment LANs.

 

5. Why would a network administrator segment a network with a Layer 2 switch? (Choose two.)

to create fewer collision domains

to enhance user bandwidth

to create more broadcast domains

to eliminate virtual circuits

to isolate traffic between segments

to isolate ARP request messages from the rest of the network

 

6.

CCNA 3 Module 4 V3.1 Answers (1)
Refer to the graphic. Which point must be reached before a frame is forwarded when the switch is using store-and-forward mode?

A

B

C

D

E

F

 

7. Hubs are concerned with which PDU?

bits

frames

packets

datagrams

 

8. Which statements are true regarding hubs? (Choose three.)

Hubs operate at Layer 1 of the OSI model.

They create separate collision domains.

Signals are distributed through all ports.

Layer 2 addresses are used to make decisions.

They calculate the CRC for each frame received prior to forwarding.

Bandwidth is shared among all connected users.

 

9. Which device provides segmentation within a single network?

hub

server

switch

transceiver

 

10. Which of the following is a Layer 2 broadcast address?

0.0.0.0

255.255.255.255

11:11:11:11

FF:FF:FF:FF

FF:FF:FF:FF:FF:FF

 

11.

CCNA 3 Module 4 V3.1 Answers (2)
Refer to the graphic. Which point in the frame must be reached before it is forwarded by a switch that is using fast-forward mode?

A

B

C

D

E

F

 

12. Which switching mode changes to store-and-forward mode after it detects a given number of errors?

cut-through

adaptive fast-forward

fragment-free

adaptive cut-through

 

13. Which form of buffering is used by bridges?

cut-through

fragment-free

fast-forward

store-and-forward

 

14. Where are switching tables stored in a Cisco LAN switch?

ROM

CAM

Flash

SIMM

NRAM

 

15. Which of the following are true regarding the addition of switches to a network? (Choose two.)

They increase the number of collision domains.

They decrease the number of collision domains.

They increase the number of broadcast domains.

They decrease the number of broadcast domains.

They increase the amount of bandwidth available to users.

They decrease the amount of bandwidth available to users.

 

16. Which of the following is used to build a switching table?

source IP addresses

destination IP addresses

destination MAC addresses

source MAC addresses

 

17. Which statements describe asymmetric switching? (Choose three.)

It uses data compression algorithms to manage higher bandwidth interfaces.

It is often used to provide high bandwidth uplinks for a number of lower bandwidth client interfaces.

It provides connections between network segments that operate at different bandwidths.

It uses cut-through forwarding when going from a lower bandwidth to a higher bandwidth interface.

It is used to provide more bandwidth to network clients than to backbone or server links.

It may require buffering frames before forwarding to the destination interface.

 

18. What does switch latency describe?

forwarding method used by a switch

time it takes for a frame to be received by a switch

improvement in network performance from using a switch

time delay between when a frame enters and exits a switch

increase in the size of a collision domain from using a switch

 

19. How does an Ethernet bridge handle an incoming frame? (Choose three.)

The source MAC address and input interface pair are added to the bridging table.

The destination MAC address and input interface pair are added to the bridging table.

If no match to the destination MAC address is found in the bridging table, the frame is discarded.

If no match to the destination MAC address is found in the bridging table, the frame is flooded out all other interfaces.

If a match to the destination MAC address is found in the bridging table, the frame is forwarded out the associated interface.

If a match to the source MAC address is found in the bridging table, the frame is forwarded to all ports.

 

20. Which attribute is used by a bridge to make forwarding decisions?

source IP address

source MAC address

destination IP address

destination MAC address

Layer 4-7 protocol address

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