1.2.5 Check Your Understanding – OSPF Packets Answers

1. Which of the following OSPF packets contains an abbreviated list of the LSDB of the sending router?

  • Type 1: Hello packet
  • Type 2: DBD packet
  • Type 3: LSR packet
  • Type 4: LSU packet
  • Type 5: LSAck packet

Explanation: The Type 2 DBD packet contains an abbreviated list of the LSDB of the sending router.

2. Which of the following OSPF packets is used by routers to announce new information?

  • Type 1: Hello packet
  • Type 2: DBD packet
  • Type 3: LSR packet
  • Type 4: LSU packet
  • Type 5: LSAck packet

Explanation: The Type 4 LSU packet is used by routers to announce new information.

3. Which of the following OSPF packets is used by routers to request more information?

  • Type 1: Hello packet
  • Type 2: DBD packet
  • Type 3: LSR packet
  • Type 4: LSU packet
  • Type 5: LSAck packet

Explanation: The Type 3 LSR packet is used by routers to request more information.

4. Which of the following OSPF packets is responsible for establishing and maintaining adjacency with other OSPF routers?

  • Type 1: Hello packet
  • Type 2: DBD packet
  • Type 3: LSR packet
  • Type 4: LSU packet
  • Type 5: LSAck packet

Explanation: The Type 1 Hello packet is responsible for establishing and maintaining adjacency with other OSPF routers.

5. Which of the following OSPF packets is used to confirm receipt of an LSA?

  • Type 1: Hello packet
  • Type 2: DBD packet
  • Type 3: LSR packet
  • Type 4: LSU packet
  • Type 5: LSAck packet

Explanation: The Type 5 LSAck packet is used to confirm receipt of another OSPF packet type.

6. Which of the following is used with the Hello Packet to uniquely identify the originating router?

  • Hello Interval
  • Router ID
  • Designated Router ID
  • Network Mask
  • Dead Interval

Explanation: The Router ID uses an 8-bit field in the OSPFv2 hello packet.

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