300-415 · Question #219
Which protocol advertises WAN Edge routes on the service side?
The correct answer is A. OSPF. On the service side of a Cisco SD-WAN WAN Edge router, OSPF is commonly used to advertise routes to and from the local area network (LAN) segment. This allows the WAN Edge to learn local prefixes and propagate them into the SD-WAN fabric.
Question
Options
- AOSPF
- BBGP
- CISIS
- DEIGRP
How the community answered
(49 responses)- A92% (45)
- B4% (2)
- C2% (1)
- D2% (1)
Why each option
On the service side of a Cisco SD-WAN WAN Edge router, OSPF is commonly used to advertise routes to and from the local area network (LAN) segment. This allows the WAN Edge to learn local prefixes and propagate them into the SD-WAN fabric.
OSPF (Open Shortest Path First) is a widely used interior gateway protocol (IGP) for route advertisement within an autonomous system, making it suitable for exchanging routes between a WAN Edge router and its connected service-side network devices.
BGP (Border Gateway Protocol) is primarily an exterior gateway protocol used for routing between autonomous systems, rather than the most common choice for service-side advertisement within an enterprise LAN.
ISIS (Intermediate System to Intermediate System) is an IGP primarily used by service providers and is less common for enterprise service-side routing compared to OSPF or EIGRP.
EIGRP (Enhanced Interior Gateway Routing Protocol) is a Cisco proprietary routing protocol, which while effective, is not as universally adopted or as frequently the primary 'service side' protocol choice in general SD-WAN contexts as OSPF.
Concept tested: WAN Edge Service-Side Routing Protocols
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-routing.html
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