Which Cisco Locator/ID Separation Protocol (LISP) device receives packets from remote site facing devices and either decapsulates the LISP packets or routes them natively?
Which Cisco Locator/ID Separation Protocol (LISP) device receives packets from remote site facing devices and either decapsulates the LISP packets or routes them natively?
The correct answer is ETR (Egress Tunnel Router). An ETR is responsible for receiving packets from core-facing interfaces (i.e., interfaces that face the transport infrastructure), and it can either decapsulate LISP packets or route them natively to local Endpoint Identifiers (EIDs) at the site. In contrast, an ITR (Ingress Tunnel Router) encapsulates packets for transmission to remote LISP sites or forwards them natively to non-LISP sites, but it does not decapsulate them.
Decap = ETR Encap = ITR Answer is B
I think there is a type in this question... This is directly from the OnDemandLearning that costs $1000.00 Ingress tunnel router (ITR): An ITR is a LISP site edge device that receives packets from site-facing interfaces (internal hosts) and encapsulates them to remote LISP sites, or natively forwards them to non-LISP sites. Egress tunnel router (ETR): An ETR is a LISP site edge device that receives packets from core-facing interfaces (the transport infrastructure), de-encapsulates LISP packets, and delivers them to local EIDs at the site. While B may look right, the ETR doesn't forward anything natively. While A may NOT look right, it DOES forward things natively. I think the question is supposed to say "encapsulates" as both A and B are wrong without that fix.
LISP Site Edge Devices • ITR-Ingress Tunnel Router is deployed as a CE device. It receives packets from site-facing interfaces, and either encapsulates packets to remote LISP sites or natively forwards packets to non-LISP sites. • ETR-Egress Tunnel Router is deployed as a CE device. It receives packets from core-facing interfaces and either decapsulates LISP packets or natively delivers non-LISP packets to local EIDs at the site. Both ETR and ITR receive packets and natively forward them, so the question's key part is " receives packets from remote site facing devices". If the packets are coming from a remote site, it means they are coming from the network core. Thus, by definition, the answer is ETR.
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/locator-id-separation-protocol-lisp/datasheet_c78-576698.html
So, here is the question. Which Cisco Locator/ID Separation Protocol (LISP) device receives packets from remote site facing devices and either decapsulates the LISP packets or routes them natively? ITR-Ingress Tunnel Router is deployed as a CE device. It receives packets from site-facing interfaces, and either encapsulates packets to remote LISP sites or natively forwards packets to non-LISP sites. • ETR-Egress Tunnel Router is deployed as a CE device. It receives packets from core-facing interfaces and either decapsulates LISP packets or natively delivers non-LISP packets to local EIDs at the site. Is it me, or do neither of these fit?
very snarky question closest answer is B
ETR: decapsulates LISP packets: https://networklessons.com/cisco/ccnp-encor-350-401/cisco-locator-id-separation-protocol-lisp
ETR-Egress Tunnel Router is deployed as a CE device. It receives packets from core-facing interfaces and either decapsulates LISP packets or natively delivers non-LISP packets to local EIDs at the site.
Answer s correct. "An ITR is a LISP site edge device that receives packets from site-facing interfaces (internal hosts) and encapsulates them to remote LISP sites or natively forwards them to non-LISP sites. An ITR is responsible for finding EID-to-RLOC mappings for all traffic destined for LISP-capable sites. When it receives a packet destined for an EID, it first looks for the EID in its mapping cache."
I am for B, because there are 2 key words in the question "recieves" and "decapsulates" , it's all about ETR only. ITR sends and ecapsulates (recieves from IP side only)
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/locator-id-separation-protocol-lisp/datasheet_c78-576698.html i was also for B until I read this article ... it is A....
The one you provided literally says the answer is B ETR :)
I think this is B - ETR: From the question - which device "receives packets from remote site facing devices" and "decapsulates the LISP packets" From https://www.ciscopress.com/articles/article.asp?p=2992605 An ITR (option A) "encapsulates them to the remote LISP site", which seems to be the opposite of what the question is asking
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/locator-id-separation-protocol-lisp/datasheet_c78-576698.html LISP Site Edge Devices • ITR-Ingress Tunnel Router is deployed as a CE device. It receives packets from site-facing interfaces, and either encapsulates packets to remote LISP sites or natively forwards packets to non-LISP sites. • ETR-Egress Tunnel Router is deployed as a CE device. It receives packets from core-facing interfaces and either decapsulates LISP packets or natively delivers non-LISP packets to local EIDs at the site.
Provided answer is correct.
it´s B https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/locator-id-separation-protocol-lisp/datasheet_c78-576698.html#:~:text=%E2%80%A2%20ITR%2DIngress,at%20the%20site.
I think ITR
When I hear Decapsulate, its ETR. Encap -ITR. MS and MR not route natively, they just respond to requests.
A is the answer direction of flow is out to in Etr is in to external. John13121 is correct.