350-401 · Question #1075
What is a difference between OSPF and EIGRP?
The correct answer is B. OSPF uses multicast addresses 224.0.0.5 and 224.0.0.6. EIGRP uses multicast address. OSPF and EIGRP primarily differ in their multicast addresses, with OSPF using 224.0.0.5 and 224.0.0.6, while EIGRP uses 224.0.0.10 for neighbor communication.
Question
Options
- AOSPF uses a default hello timer of 5 seconds. EIGRP uses a default hello timer of 10 seconds.
- BOSPF uses multicast addresses 224.0.0.5 and 224.0.0.6. EIGRP uses multicast address
- COSPF uses an administrative distance of 115. EIGRP uses an administrative distance of 160.
- DOSPF uses IP protocol number 88. EIGRP uses IP protocol number 89.
How the community answered
(24 responses)- A4% (1)
- B88% (21)
- D8% (2)
Why each option
OSPF and EIGRP primarily differ in their multicast addresses, with OSPF using 224.0.0.5 and 224.0.0.6, while EIGRP uses 224.0.0.10 for neighbor communication.
OSPF's default hello timer on broadcast/point-to-point networks is 10 seconds, while EIGRP's default hello timer is 5 seconds on high-bandwidth links, meaning the statement incorrectly swaps these values.
OSPF uses the multicast address 224.0.0.5 to communicate with all OSPF routers and 224.0.0.6 to communicate specifically with Designated Routers (DR) and Backup Designated Routers (BDR). EIGRP, in contrast, uses the multicast address 224.0.0.10 for sending hello packets and updates to other EIGRP routers.
OSPF has an administrative distance (AD) of 110. EIGRP's internal AD is 90, and its external AD is 170, so both values provided in the statement are incorrect.
OSPF uses IP protocol number 89 and EIGRP uses IP protocol number 88; the statement incorrectly swaps these protocol numbers.
Concept tested: OSPF and EIGRP protocol differences
Source: https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/16406-eigrp-ospf-k.html
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