Preparing Practice Exam…
Please wait a moment while the system generates the exam questions, answers, and study session.
Please wait a moment while the system generates the exam questions, answers, and study session.
Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) · Cisco
Select 2 answers.
This question asks for 2 answers, but our data marks only 1. Compare with the community discussion below for the full answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
LDP uses UDP for its hello multicast packets but then uses TCP to build the adjacency.
A. The label edge router swaps labels on the received packets. >> not true, edge routers add or remove labels B. Labels are imposed in packets after the Layer 3 header. >> not true, labels are imposed after L2 and before L3 C. LDP uses TCP for reliable delivery of information. >> OK D. An MPLS label is a short identifier that identifies a forwarding equivalence class. >> OK E. A maximum of two labels can be imposed on an MPLS packet. >> seems not true, "All IPv4 packets have one or more labels." - more info https://www.ciscopress.com/articles/article.asp?p=680824&seqNum=5
A. The label edge router swaps labels on the received packets. LSR swap label and LER take away the label or add the label when receive packet… but compare to other it seem this is more correct than other B. Labels are imposed in packets after the Layer 3 header. Label is layer 2.5 C. LDP uses TCP for reliable delivery of information. LDP is udp D. An MPLS label is a short identifier that identifies a forwarding equivalence class. Mpls label consists of the label and a fec for traffic engineering use. Not only fec E. A maximum of two labels can be imposed on an MPLS packet. One mpls label for lfib routing, one mpls vpn label for ibgp routing