Question 1.
Which of the following protocols are naturally classful?
(Choose 2)

a) IS-IS
b) RIP
c) EIGRP
d) OSPF

Answer

Question 2.
Which of the following protocols broadcasts routing updates?

a) RIPv1
b) OSPF
c) EIGRP
d) IS-IS

Answer

Question 3.
Which types of area are most alike?

a) IS-IS type 1 and OSPF stubby
b) IS-IS type 2 and OSPF NSSA
c) IS-IS type 1 and OSPF totally stubby
d) IS-IS type 0 and OSPF area 0.0.0.0

Answer

Answers

Question 1.
Which of the following protocols are naturally classful?
(Choose 2)

a) IS-IS
b) RIP
c) EIGRP
d) OSPF

Answer
b) RIP
c) EIGRP

Explanation
RIP, even RIPv2, is naturally classful. The difference in RIPv2 is that it can support variable length subnetting.

For compatibility with IGRP, EIGRP will behave classfully until you code the no auto-summary command.
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Question 2.
Which of the following protocols broadcasts routing updates?

a) RIPv1
b) OSPF
c) EIGRP
d) IS-IS

Answer
a) RIPv1

Explanation
RIPv1 always sends UDP broadcasts for its updates. RIPv2 has the capability of either broadcasting or multicasting them.

EIGRP and OSPF send IP multicasts directly over IP. IS-IS multicasts, but over the data link layer.
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Question 3.
Which types of area are most alike?

a) IS-IS type 1 and OSPF stubby
b) IS-IS type 2 and OSPF NSSA
c) IS-IS type 1 and OSPF totally stubby
d) IS-IS type 0 and OSPF area 0.0.0.0

Answer
c) IS-IS type 1 and OSPF totally stubby

Explanation
Only the default route is injected from the backbone into OSPF totally stubby areas and IS-IS type 1 areas. OSPF stubby areas can receive inter-area routes, but standard IS-IS type 1 areas cannot.

There is no such thing as an IS-IS type 0 area.
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