03-12-2012, 02:34 PM
If the router RT1 has a packet with a destination address 192.168.1.255, which statement below describes the operation of the network?
A ? RT1 forwards the frame containing this packet, SW1 will add 192.168.1.255 to its MAC table
B ? RT1 will drop this packet because it is not a valid IP address
C ? RT1 will forward the packet out all interfaces
D ? RT1 will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF
E ? As RT1 forwards the frame containing this packet, SW1 will forward it ti the device assigned the IP address of 192.168.1.255
h2pass Answer: B
well, 192.168.1.255 might be not a valid HOST ip address, but it is still a valid broadcast IP address for the 192.168.1.0/24 network.
If directed broadcasts were enabled with ip directed-broadcast interface subcommand or the router has the IOS prior to 12.x, where directed broadcast was enabled by default, the router will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF.
I do not know which IOS version this question refers to, but it might be a very old question.
But anyway "not a valid IP address" is a wrong statement.
What do you think?
A ? RT1 forwards the frame containing this packet, SW1 will add 192.168.1.255 to its MAC table
B ? RT1 will drop this packet because it is not a valid IP address
C ? RT1 will forward the packet out all interfaces
D ? RT1 will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF
E ? As RT1 forwards the frame containing this packet, SW1 will forward it ti the device assigned the IP address of 192.168.1.255
h2pass Answer: B
well, 192.168.1.255 might be not a valid HOST ip address, but it is still a valid broadcast IP address for the 192.168.1.0/24 network.
If directed broadcasts were enabled with ip directed-broadcast interface subcommand or the router has the IOS prior to 12.x, where directed broadcast was enabled by default, the router will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF.
I do not know which IOS version this question refers to, but it might be a very old question.
But anyway "not a valid IP address" is a wrong statement.
What do you think?