English FormB CCNA3 Version3.1 Module4 – 2006 fall
1. 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
2. Which of the following is used to build a switching table?
source IP addresses
destination IP addresses
destination MAC addresses
***source MAC addresses
3. 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.
4. 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
5. 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.
6. 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.
7. 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.
8. Hubs are concerned with which PDU?
***bits
frames
packets
datagrams
9. 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
10. Which form of buffering is used by bridges?
cut-through
fragment-free
fast-forward
***store-and-forward
11. Where are switching tables stored in a Cisco LAN switch?
ROM
***CAM
Flash
SIMM
NRAM
12. 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.
13. 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
14. 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
15. 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
16. 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
17. 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
18. 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.
19. 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
20. Which device provides segmentation within a single network?
hub
server
***switch
transceiver
www.inafridge.com – 2006