NSE4 · Question #224
Review the output of the command config router ospf shown in the Exhibit below; then answer the question following it. Which one of the following statements is correct regarding this output?
The correct answer is C. OSPF Hello packets will be sent on all interfaces configured with an address matching the. OSPF Hello packets are only sent on interfaces whose IP addresses match the configured config network ranges, enabling OSPF to establish adjacencies on specific network segments.
Question
Review the output of the command config router ospf shown in the Exhibit below; then answer the question following it. Which one of the following statements is correct regarding this output?
Exhibit
Options
- AOSPF Hello packets will only be sent on interfaces configured with the IP addresses
- BOSPF Hello packets will be sent on all interfaces of the FortiGate device.
- COSPF Hello packets will be sent on all interfaces configured with an address matching the
- DOSPF Hello packets are not sent on point-to-point networks.
How the community answered
(61 responses)- A2% (1)
- B7% (4)
- C90% (55)
- D2% (1)
Why each option
OSPF Hello packets are only sent on interfaces whose IP addresses match the configured `config network` ranges, enabling OSPF to establish adjacencies on specific network segments.
This statement is incomplete; OSPF Hello packets are sent on interfaces that have an IP address *matching the configured OSPF network ranges*, not just any configured IP address.
OSPF Hello packets are not sent on all interfaces of the FortiGate; they are restricted to interfaces that are explicitly included in the OSPF process by the `config network` statements.
The `config network` statements in OSPF (`set prefix 10.0.0.0 255.0.0.0` and `set prefix 172.16.0.0 255.240.0.0`) define which interfaces are enabled for OSPF communication. OSPF Hello packets are specifically sent out only on interfaces whose IP addresses fall within these configured network ranges to discover neighbors and form adjacencies.
OSPF Hello packets are indeed sent on point-to-point networks to establish neighbor relationships, unless the interface is configured as passive.
Concept tested: OSPF network configuration and Hello packet distribution
Source: https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/33917/ospf
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