200-150 Question #59: Real Exam Question with Answer & Explanation

The correct answer is B: OSPF. OSPF and RIP (labeled RP) are IP-native routing protocols that operate exclusively over IP, unlike IS-IS which runs over Layer 2 using CLNS and does not require an IP network layer.

Cisco Data Center Networking Technologies

Question

A network design team has mandated that IP-only routing protocols be used in the network. Which two routing protocols will they want to use? (Choose two.)

Options

ABGP
BOSPF
CRP
DEIGRP
EIS-IS

Explanation

OSPF and RIP (labeled RP) are IP-native routing protocols that operate exclusively over IP, unlike IS-IS which runs over Layer 2 using CLNS and does not require an IP network layer.

Common mistakes.

A. BGP operates over TCP/IP but supports multi-protocol extensions (MP-BGP) enabling it to carry routing information for non-IP address families such as IPv6 VPNs and CLNS, making it not strictly IP-only.
D. EIGRP is a Cisco proprietary protocol that, while primarily IP-based, historically supported non-IP routed protocols such as IPX and AppleTalk in legacy implementations.
E. IS-IS is an ISO link-state protocol that uses CLNS (Connectionless Network Service) and NET addresses operating directly over Layer 2, allowing it to function independently of IP and disqualifying it as an IP-only protocol.

Concept tested. IP-only vs. non-IP routing protocol classification

Reference. https://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/13795-is-is-vs-ospf.html

Topics

#IP routing protocols#OSPF#routing#protocol selection

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