200-150 · Question #59
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.)
The correct answer is B. OSPF C. RP. 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.
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
How the community answered
(26 responses)- A4% (1)
- B88% (23)
- E8% (2)
Why each option
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.
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.
OSPF uses IP protocol number 89 and operates natively over IP infrastructure, making it a purely IP-dependent routing protocol that cannot function without an IP network layer.
RIP (shown here as RP) transmits routing updates encapsulated in UDP/IP datagrams, making it strictly dependent on IP transport and qualifying as an IP-only routing protocol.
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.
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
Source: https://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/13795-is-is-vs-ospf.html
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