300-415 Question #314: Real Exam Question with Answer & Explanation

Question

Options

• AIt uses TCP acknowledgment (ACK).
• BIt uses TCP selective acknowledgment (SACK).
• CIt terminates TCP connections locally at the WAN edge.
• DIt terminates TCP connections at the remote WAN edge
• EIt is used to take care of high packet loss for control traffic.

Explanation

The TCP optimization tool in Cisco SD-WAN improves performance by using TCP Selective Acknowledgment (SACK) and by locally terminating TCP connections at the WAN edge.

Common mistakes.

• A. While TCP uses ACKs, the specific optimization involves Selective ACKs (SACK) for improved retransmission efficiency, making the general statement about TCP ACK too broad.
• D. TCP optimization terminates connections locally at the originating WAN edge and then re-establishes them to the remote WAN edge, rather than terminating connections only at the remote WAN edge.
• E. TCP optimization primarily addresses data traffic performance and reliability, not control traffic, which uses its own robust protocols and is not typically subject to the same TCP optimizations.

Concept tested. Cisco SD-WAN TCP optimization functions

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/policies/sdwan-policies-book/sdwan-tcp-optimization.html

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