CCNP 350-401 Q62
本帖最后由 tatrick42034 于 2020-7-20 13:46 编辑QUESTION 62
Which LISP device is responsible for publishing EID-to-RLOC mappings for a site?
A.ETR
B.MR
C.ITR
D.MS
Correct Answer: A
各位论坛的大神们有谁可以帮解惑，这题题库答案是A，但我查了参考资料之后感觉是B，大家集思广益下
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底下是我從參考書上翻到的資訊
• Ingress tunnel router (ITR): ITRs are LISP routers that LISP-encapsulate IP packets coming from EIDs that are destined outside the LISP site.
• Egress tunnel router (ETR): ETRs are LISP routers that de-encapsulate LISPencapsulated IP packets coming from sites outside the LISP site and destined to EIDs within the LISP site.
• Map server (MS): This is a network device (typically a router) that learns EIDto-prefix mapping entries from an ETR and stores them in a local EID-to-RLOC mapping database.
• Map resolver (MR): This is a network device (typically a router) that receives LISP-encapsulated map requests from an ITR and finds the appropriate ETR to answer those requests by consulting the map server.
LISP Egress Tunnel Router
An ETR connects a site to the LISP-capable part of a core network (such as the Internet), publishes EID-to-RLOC mappings for the site, responds to Map-Request messages, and decapsulates and delivers LISP-encapsulated user data to end systems at the site. During operation, an ETR sends periodic Map-Register messages to all its configured map servers. The Map-Register messages contain all the EID-to-RLOC entries for the EID-numbered networks that are connected to the ETR’s site.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_lisp/configuration/xe-3s/irl-xe-3s-book/irl-overview.html
题目呢。 {:6_267:} AlltoWell 发表于 2020-7-20 15:49
LISP Egress Tunnel Router
An ETR connects a site to the LISP-capable part of a core network (such a ...
thanks for your reply 对端 不懂，只知道背题库
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