4A0-101

4A0-101 practice questions, page 6 of 13, with answer review and explanations.

Question 26

What is the protocol number for OSPF in the IP header?

  1. OSPF uses TCP, so the protocol number is 6.
  2. OSPF uses UDP, so the protocol number is 17.
  3. OSPF does not use IP.
  4. OSPF has its own protocol number of 89.

Question 27

Click the exhibit button. Which of the following would correctly configure routers R2, R3, and R4?

  1. Option A
  2. Option B
  3. Option C
  4. Option D

Question 28

When are virtual links used in OSPF?

  1. When two areas need to communicate and there is no area 0.
  2. When an area needs to traverse another area to reach area 0.
  3. When two areas are connected to area 0, but there is no direct path between them.
  4. When an area needs to connect directly to another area without using area 0.

Question 29

Which of the following statements regarding area border routers in an OSPF network is true?

  1. The term backbone router has the same definition as the term area border router.
  2. An OSPF network needs at least one area border router to function.
  3. Area border routers connect the backbone area to other areas in an OSPF network.
  4. By definition, an area border router must perform route summarization between areas.

Question 30

Which of the following correctly lists the 5 OSPF packet types?

  1. Hello, link state update, link state packet, link State acknowledgement, database description.
  2. Link state update, link state refresh, link state acknowledgement, database description, notification.
  3. Hello, link state refresh, link state update, link state acknowledgement, link state authentication.
  4. Hello, link state update, link state request, link state acknowledgement, database description.