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net-unreachable e. access-list 101 permit udp any any access-list 101 permit icmp any any protocol-unreachable 27.what does the bgp backdoor command do? a. it changes the distance of an ibgp route to 20. b. it changes the distance of an ebgp route to 200. c. it changes the distance of an igp route to 20. d. it does not effect any changes in distance of the route. e. it changes the distance of an igrp route to 200. 28.which of the following dns resource records is not valid? a. ns b. ptr c. mx d. fqdn e. a 29.which of the following features is provided by rip v2 that were previously not possible with rip v1? (choose all that apply.) a. classless routing and split-horizon. b. poison reverse and updating to multicast addresses. c. poison reverse and classless routing. d. classless routing and updating to multicast addresses. e. route tag and classless routing. 30.which of the following statements is valid when taking custom queuing into account? a. custom queuing has the ability to restrict a particular type of traffic to a given bandwidth not matter what is load is like on that link. 本新闻共2页,当前在第1页 1 2  本文共2页：第 【1】 【2】 页
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