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300-420 · Question #254
300-420 Question #254: Real Exam Question with Answer & Explanation
The correct answer is A: IS-IS. Cisco LAN Automation deploys IS-IS as the underlay IGP in SD-Access to automatically discover and establish routed adjacencies between fabric nodes.
Advanced Enterprise Campus Networks
Question
Which protocol is deployed through LAN automation to build node-to-node underlay adjacencies in SDA?
Options
- AIS-IS
- BLISP
- COSPF
- DVXLAN
Explanation
Cisco LAN Automation deploys IS-IS as the underlay IGP in SD-Access to automatically discover and establish routed adjacencies between fabric nodes.
Common mistakes.
- B. LISP is the overlay control plane protocol used by SD-Access for endpoint registration and location-identity separation, not the underlay routing protocol deployed by LAN Automation.
- C. OSPF is not the underlay protocol used by Cisco LAN Automation in SD-Access; IS-IS is specifically chosen and configured by the automation workflow.
- D. VXLAN is the data plane encapsulation technology for the SD-Access overlay and does not establish routing adjacencies or serve as an underlay IGP.
Concept tested. LAN Automation underlay IGP protocol in SD-Access
Reference. https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html
Topics
#SDA#LAN Automation#IS-IS#Underlay Adjacencies
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