IMHO the SACK feature in TCP is standard for number of years between ordinary TCP hosts.
I don't quite understand why is cisco SDWAN pinpointing here this as groundbreaking SDWAN optimization.
BC
The Cisco SD-WAN TCP Optimization feature terminates TCP connections locally at the WAN edge routers and uses TCP Selective Acknowledgment (SACK) in order to better control the TCP-Window-Size and maximize the throughput through the WAN links
Based on this article:
https://www.networkacademy.io/ccie-enterprise/sdwan/application-quality-of-experience-appqoe#:~:text=The%20Cisco%20SD%2DWAN%20TCP,throughput%20through%20the%20WAN%20links.
The Cisco SD-WAN TCP Optimization feature terminates TCP connections locally at the WAN edge routers and uses TCP Selective Acknowledgment (SACK) in order to better control the TCP-Window-Size and maximize the throughput through the WAN links.
It is B and C.
When you enable TCP optimization on the two routers, Router A terminates the TCP connection from the client and establishes a TCP connection with Router B.
A and C could be correct :
https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/appqoe/ios-xe-17/appqoe-book-xe/m-tcp-optimization.html#:~:text=TCP%20optimization%20fine%20tunes%20the,Catalyst%20SD%2DWAN%20devices.
It is recommended that you configure TCP optimization on both the routers, the router closer to the client and the router closer to the server. This configuration is sometimes called a dual-ended proxy.
"It is possible to configure TCP optimization only on the router closer to the client", a scenario called single-ended proxy, but this configuration is not recommended because the TCP optimization process is compromised. TCP is a bidirectional protocol and operates only when connection-initiation messages (SYNs) are acknowledged by ACK messages in a timely fashion.
I dont know... it could be local (at client) and it is using Selective ACK...
The optimization is done between both end routers:
https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/optimization-ha/ios-xe-16/network-optimization-high-availability-book-xe/m-tcp-optimization.html#:~:text=This%20feature%20optimizes%20TCP%20data,trip%20latency%20and%20improve%20throughput.
When you enable TCP optimization on the two routers, Router A terminates the TCP connection from the client and establishes a TCP connection with Router B. Router B then establishes a TCP connection to the server. The two routers cache the TCP traffic in their buffers to ensure that the traffic from the client reaches the server without allowing the TCP connection to time out.
Not mentioning termination of remote TCP connection here , so why D is correct?
upvoted 1 times
...
...
This section is not available anymore. Please use the main Exam Page.300-415 Exam Questions
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
mikidvd51
5 months, 3 weeks agoGycu
1 year, 1 month agoRafaJohnston76
1 year, 1 month agoabvga
1 year, 2 months agoabvga
1 year, 2 months agoTsartipi
1 year, 2 months agoZamochit
1 year, 2 months agoKnowledge33
1 year, 3 months agoTsartipi
1 year, 2 months ago