A. Incorrect, Auto-summary in OSPF is only permitted on ASBR and ABR routers. On the other hand, EIGRP auto-summary could be configured on any router.
C. Incorrect, OSPF doesn't support unequal-cost load balance. EIGRP supports equal and non-equal load balancing.
D. Incorrect, OSPF uses multicast addresses (224.0.0.5 and 224.0.0.6) to send LSAs, while EIGRP can use both multicast (224.0.0.10) and unicast.
B. Correct! Both protocols use hello packets to discover their neighbor with different hello,& dead timers by default.
Correction: OSPF supports only manual route summarization, and we have to configure it only on ABR or ASBR routers.
https://networklessons.com/ospf/how-to-configure-ospf-summarization#:~:text=OSPF%20can%20do%20summarization%2C%20but,LSA%20types%203%20and%205.
Similarities : EIGRP and OSPF are both Internal Gateway Protocols (IGP), support VLSM and ECMP, and use Hello packets to establish neighbor relationships.
Difference : EIGRP is Cisco's proprietary Advanced Distance Vector Protocol that uses the DUAL algorithm, while OSPF is an open standard link state protocol that uses the SPF algorithm.
A is incorrect because OSPF does not support autosummarization by default, while EIGRP does.
B okidoki & correcto
C wrong as EIGRP does support unequal-cost LB
D nope, this is done by Multicast
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