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Q. 93
Which two statements accurately define IP addressing rules? (Choose Two)
A. IP multicast addresses start with 240
B. A host portion of all 1’s indicates a network broadcast
C. The value of zero (0) in the host portion means “all hosts” on the network
D. IP addresses are four octets long and contain a network portion and a host portion
Answer: B, D
Explanation: IP addresses contain 4 octets. IP addresses contain two parts: one to identify the network and the
other to determine the host. Which octet identifies what is dependant on the class of the IP address. When a
message is to be flooded the IP address contain all 1s.
Incorrect Answers:
A is incorrect; multicast broadcasts of range of IPs is 224-239t. 240 begins the range of reserved (Class E)
addresses.
C is incorrect; to flood a message to all host of a network, the IP address would contain the network
identification and then all 1s (represented by 255) in the host portion of an IP.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 222-232.
Q. 94
Which three statements about Frame Relay configuration using sub interfaces are true? (Choose three)
A. Each subinterface is configured either multi point or point to point.
B. Any network address must be removed from the physical interface.
C. The configuration of subinterfaces is done in router Config-(if)# mode.
D. Frame relay encapsulation must be configured on each sub interface.
Answer: A, B, C
Explanation: When configuring Frame Relay at the sub interface there are a number of points that you be kept
in mind. To configure subinterfaces on a physical interface, do the following:
1. Select the interface you want to create subinterfaces on, enter interface configuration mode, (config-if)#.
2. It is recommended that you remove any network layer address assigned to the physical interface and
assign the network layer address to the subinterface.
3. Configure Frame Relay encapsulation on the physical interface.
4. Identify the subinterface as either multipoint or point-to-point.