Ccna certification Practice Tests

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 195.  C.  Computer A will create an ARP (broadcast) request. When that request is received 

on port Fa0/0, the switch will record Computer A’s MAC address on Fa0/0. Then it 

will forward the message to all ports because the initial ARP packet/frame is a layer 2 

broadcast. The switch will not directly communicate with Fa0/1 because the MAC address 

table is empty and the initial ARP packet/frame is a broadcast. The switch will only record 

Computer B’s MAC address on port Fa0/1 when Computer B responds to the initial ARP 

packet/frame with a frame containing the source MAC address.

 196.  B.  Since the MAC address table has the MAC address for Computer B, the switch will 

direct the frame to port Fa0/1 only. The switch will only forward the frame to all active 

ports if the MAC address table didn’t contain the destination MAC address for Computer 

B. The switch will only record Computer A’s MAC address on port Fa0/0 if the MAC 

address was not already populated in the table for that specific port. Likewise the switch 

will only record Computer B’s MAC address on port Fa0/1 if the MAC address was not 

already populated in the table for that specific port.

 197.  B.  The destination MAC address for broadcasts is always all fs, such as ffff.ffff.ffff. The 

source MAC address of the frame will be the specific MAC address of the host. The switch 

will broadcast the frame to all ports and not just the individual port the ARP request is 

trying to discover. The switch will not respond directly back with an ARP reply because 

switches do not process ARP requests; only routers can respond when configured as an 

ARP proxy, which is very rare.

 198.  C.  When the destination MAC address is not in the MAC address table, the switch will 

flood the frame to all ports on the switch. When the computer or device responds, the 

switch will record the source MAC address with the port on which it sees the traffic. 

When the source MAC address is unknown by the switch, it is recorded in the MAC 

address table as previously described. When a multicast address is seen by the switch, it is 

selectively switched to specific ports. A MAC address is never set to 0000.0000.0000, as it 

is an invalid format for a MAC address.

 199.  C.  MAC address tables, also called CAM tables, are always built and stored temporarily 

in RAM. When the switch is turned off or the 

clear command is issued, the table no 

longer exists. Flash is used to store the Internetwork Operating System (IOS) for the 

switch or router. The CPU registers, also called the configuration registers, explain to 

the switch how to boot. The non-volatile random access memory (NVRAM) is where the 

configuration is stored; it is similar to flash and usually much smaller.

 200.  B.  The command to see the MAC address table is 

show mac address-table. However, 

on some 4000 and 6500 series switches, the command 

show cam dynamic will perform 

the same function. The command 

show mac is incorrect. The command show cam table 

is incorrect. The command 

show mac table is incorrect.

 201. D. The 

show interfaces status command will display the port number, connected 

status, VLAN, duplex, speed, and type of interface. The command 

show ports is 

incorrect. The command 

show counters interfaces is incorrect. The command show 

interfaces counters is incorrect.

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