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- Question
If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?
Options- A. Discard it and send an error message back to the originating host
- B. Flood the network with the frame
- C. Add the source addres and port to the MAC address table and forward the frame out the destination port
- D. Add the destination to the MAC address table and then forward the frame
- Correct Answer
- Add the source addres and port to the MAC address table and forward the frame out the destination port
ExplanationSince the source MAC address is not in the MAC address table, the switch will add the source address and the port it is connected to into the MAC address table and then forward the frame to the outgoing port.
- 1. Your switch has a port status LED that is alternating between green and amber. What could this indicate?
Options- A. The port is experiencing errors
- B. The port is shut down
- C. The port is in STP blocking mode
- D. Nothing, this is normal. Discuss
- 2. What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?
Options- A. Forwards the switch to the first available link
- B. Drops the frame
- C. Floods the network with the frame looking for the device
- D. Sends back a message to the originating station asking for a name resolution Discuss
- 3. When is redistribution required for EIGRP? Discuss
- 4. Where are EIGRP successor routes stored?
Options- A. In the routing table only
- B. In the neighbor table only
- C. In the routing table and neighbor table
- D. In the routing table and the topology table Discuss
- 5. You get a call from a network administrator who tells you that he typed the following into his router: Router (config) #router ospf 1 Router (config-router) # network 10.0.0.0. 255. 0.0.0 area 0 He tells you he still can't see any routes in the routing table. What configuration error did the administrator make?
Options- A. The wildcard mask is incorrect
- B. The OSPF area is wrong
- C. The OSPF Process ID is incorrect.
- D. The AS configuration is wrong Discuss
- 6. What command will display the forward / filter table?
Options- A. Show mac filter
- B. show run
- C. show mac address-table
- D. show mac filter-table Discuss
- 7. You want to run the new 802.1w on your switches. which of the following would enable this protocol?
Options- A. Switch (config) # Spanning-tree mode rapid-pvst
- B. Switch#spanning-tree mode rapid-pvst
- C. Switch (config)#spanning-tree mode 802.1w
- D. Switch#spanning-tree mode 802.1w Discuss
- 8. You have two switches connected together with two crossover cables for redundancy, and STP is disabled. Which of the following will happen between the switches?
Options- A. The routing tables on the switches will not update
- B. The MAC forward/;filter table will not update on the switch
- C. Broadcast storms will occur on the switched network
- D. The switches will automatically load-balance between the two links Discuss
- 9. Which proprietary Cisco STP extensions would put a switch port into err-disabled if a BPDU is received on this port? Discuss
- 10. Which Cisco 802.1d extension stops BPDU from being transmitted out a port? Discuss
CISCO Certification problems
Search Results
Correct Answer: The port is experiencing errors
Explanation:
When you connect to a switch port, at first the link lights are orange/amber, and then they turn green, indicating normal operation. If the link light is blinking, you have a problem.
Correct Answer: Floods the network with the frame looking for the device
Explanation:
Switches flood all frames that have an unknown destination address. If a device answers the frame, the switch will update the MAC address table to reflect the location of the device.
Correct Answer: Redistribution is required when more than one EIGRP session or process is running and they are identified with different ASNs Redistribution shares topology information between EIGRP sessions
Correct Answer: In the routing table and the topology table
Explanation:
Successor routes are going to be in the routing table since they are the best path to a remote network. However, the topology table has a link to each and every network, so the best answer is topology table and routing table. Any secondary route to a remote network is considered a feasible successor, and those routes are found only in the topology table and used as backup routes in case of primary route failure.
Correct Answer: The wildcard mask is incorrect
Explanation:
The administrator typed in the wrong wildcard mask configuration. The wildcard should have been 0.0.0.255 or even 0.255.255.255.
Correct Answer: show mac address-table
Explanation:
The Command show mac address-table displays the forward/filter table on the switch.
Correct Answer: Switch (config) # Spanning-tree mode rapid-pvst
Explanation:
802.1w is the also called Rapid Spanning Tree Protocol. It is not enabled by default on Cisco switches, but it is a better STP to run since it has all the fixes that the Cisco extensions provide with 802.1d
Correct Answer: Broadcast storms will occur on the switched network
Explanation:
If spanning tree is disabled on a switch and you have redundant links to another switch, broadcast stroms will occur, among other possible problems.
Correct Answer: BPDUGuard
Correct Answer: PortFast
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