ࡱ> a jbjbtt $&[N8 ,N6(:::   W6Y6Y6Y6Y6Y6Y6,7R96     6!::6!!! ::W6!D", W6!!4W6 z!pw5W66065:!:,W6!NN$r$ NNr ECE 455 Optional Mid Term 2 8 December 2005 Some useful commands that you may need for this exam: ip nat {inside|outside} access-list nnn {permit|deny} protocol source-address source-wildcard [operator port] destination-address destination-wildcard [operator port] ip nat pool name start-ip end-ip {netmask netmask | prefix-length prefix-length} ip nat inside source list access-list-number {pool name | interface interface-id} overload encapsulation ppp ppp authentication {chap | pap} Fig. 1 shows a simplified version of the first configuration we will use in ECE655. This configuration will be used in some of the test questions.  Give three reasons why you might want to use NAT translation in your network. Show the configuration commands that would be needed in p1r1 in order to get all outgoing traffic on s0/0 to translate local 10.1.x.x addresses to the shared pool of addresses ranging from 172.31.1.5 to 172.31.1.9 Show the commands that would be needed in p1r1 to prevent any traffic from the 10.1.0.0/24 network from passing through p1r1 down to p1r3. Do not prevent this traffic from passing through p1r1 and out the s0/0 interface to the outside world. Show the commands needed in p1r1 to run RIPv2, exchanging RIP information on interfaces s0/1 and FA0/0, but not on s0/0. Subnets. Given the IP address 100.73.15.77 mask 255.252.0.0 What is the range of valid host addresses on this subnet? __________________________________________ What is the broadcast address for this subnet? ____________________ What is the address of the subnet itself? _______________________ What class is the network containing this subnet? (A, B, or C?) _____ What is the IP address in / notation? _________________________ How many subnets of this size are possible in the classful network to which it belongs? ___________________ How many valid host addresses are their in this subnet ________________ Given the IP address 193.193.193.178/26 What is the range of valid host addresses on this subnet? ______________________________________________ What is the broadcast address for this subnet? ____________________ What is the address of the subnet itself? ________________________ What class is the network containing this subnet? (A, B, or C?) _____ Express this mask in dotted decimal notation (as in 1a)? ___________________________________ How many subnets of this size are possible in the classful network to which it belongs? ______________ How many valid host addresses are there in this subnet ____________ Consider the following routing protocols when answering the following questions: RIPv1 IGRP RIPv2 EIGRP OSPF BGP Which protocols are external gateway protocols? Which protocols are pure distance vector protocols? Which interior gateway protocols have auto summarization by default? Which interior gateway protocols do not allow you to turn off auto-summarization? Which protocols would be used for routing in the internet itself? Which interior protocols allow breaking the network into a hierarchy of separate areas? Which interior protocols use the shortest-path first algorithm? Which interior protocols use the Bellman-Ford algorithm? Which interior protocols use the DUAL algorithm? Which interior protocols do not have the counting to infinity problem at all? Which interior protocol has the quickest convergence for reasonable sized networks? Split horizon: What is it? Does it always prevent counting to infinity? What technique is normally used in conjunction with split horizon? What is the difference between synchronous and asynchronous serial communication? If router p1r1 is using ppp with chap authentication on s0/0, what username does it use when connecting with bbr1? 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