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68. Which of the following is true about the Network layer? (Choose all that apply)
A. Uses broadcasts B. Uses two-part addresses
C. Defines the rules for sending and receiving information from one node to another between systems D. Provides mechanisms for multiplexing upper layer applications
E. Discovers networks
F. Adapts to internetwork topology changes
Answer: A, B, E, F
The Network layer of the OSI Reference model establishes network addresses, selects the best path through
an internetwork, can use routing protocol between routers, can also use a routed protocol to carry user
packets (IP). The Network layer also uses two-part addresses, sets up and maintains routing tables, discovers networks, adapts to internetwork topology changes and contains broadcasts.
Chapter: 2
69. What OSPF term refers to a network or router interface assigned to any given interface?
A. Link
B. Area C. LSA
D. STP
Answer: A
Within OSPF, link is synonymous with interface.
Chapter: 2
70. What is the class, subnet and broadcast address of the following IP address: 10.0.1.12
255.255.255.128?
A. Class B, subnet 10.255.255.254, broadcast 10.0.1.127 B. Class A, subnet 10.0.1.0, broadcast 10.255.255.255
C. Class C, subnet 10.0.1.0, broadcast 10.0.1.255
D. Class A, subnet 10.0.1.0, broadcast 10.0.1.127
Answer: D
This isn't as hard as it looks. There are only 7 host bits. If you turn them all off you get 0, if you turn them all
on, you get 127. Since you can't use a host with all 0's or all 1's, the valid hosts are the numbers between (1-
126). The broadcast address is the host bits set to all 1's.
Chapter: 2