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EIGRP Configuration
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6 Enter the EIGRP command or commands to include the interfaces with 19216811/26, 192168165/26, and 1921681129/26 in the routing process: __________ 7 Enter the EIGRP command to advertise specific subnets, instead of advertising summarized classful routes, across a class boundary: __________
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8 When examining the IP routing table, an EIGRP route will be shown as what letter A B C D I R O D
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9 Enter the EIGRP command to view only the successor routes: __________ 10 Enter the EIGRP command to view both the successor and feasible successor routes: __________
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1 D EIGRP supports three routed protocols: IP, IPX, and AppleTalk A is incorrect because it omits IPX and AppleTalk B is incorrect because it omits AppleTalk C is incorrect because it omits IPX 2 C EIGRP uses the DUAL algorithm to update its routing table A is incorrect because Bellman-Ford is used by the distance vector protocols B is incorrect because Dijkstra is used by link state protocols D is a nonexistent routing algorithm
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3 A EIGRP generates hellos every 5 seconds B, C, and D are incorrect hello periods 4 A A successor route is the best path to reach a destination within the topology table B is incorrect because a feasible successor is a valid backup route C, advertised distance, refers to a neighbor s distance to a route D, feasible distance, refers to a router s distance to a route 5 D A multicast query message is sent to neighbors to determine whether a nonfeasible successor route to a destination is valid A is incorrect because this is the state the route is in, not the message sent B is incorrect because EIGRP uses multicasts, not broadcasts C is incorrect because a reply message is in response to a query
EIGRP Configuration
6 network 19216810 7 no auto-summary
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8 D A D in the routing table indicates an EIGRP route A is incorrect because an I indicates an IGRP route B is incorrect because an R indicates a RIP route C is incorrect because an O is an OSPF route 9 show ip route Successor routes are populated in the router s IP routing table 10 show ip eigrp topology
Part VI
Advanced Cisco Router Features
CHAPTERS
22 23 Access Control Lists Address Translation 24 IPv6
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Access Control Lists
CERTIFICATION OBJECTIVES
2201 2202 2203 ACL Overview Basic ACL Configuration ACL Types 2204 ACL Placement Two-Minute Drill Self Test
Copyright 2008 by The McGraw-Hill Companies Click here for terms of use
22: Access Control Lists
he last few chapters introduced you to routing protocols and their basic configuration By default, once you set up routing, your router will allow any packet to flow from one interface to anotherYou may want to implement policies to restrict the flow of traffic, for security or traffic policy reasons Cisco allows you to control the flow of traffic from one interface to another by using access control lists (ACLs) ACLs, pronounced ackles, are a powerful feature of the Internetwork Operating System (IOS) Cisco actually supports ACLs for protocols other than IP, including Internetwork Packet Exchange (IPX), AppleTalk, layer 2 traffic, and others This chapter focuses only on IP ACLs
CERTIFICATION OBJECTIVE 2201
ACL Overview
ACLs, known for their ability to filter traffic as it either comes into or leaves an interface, can also be used for other purposes, including restricting remote access (virtual type terminal, or VTY) to an IOS device, filtering routing information, prioritizing traffic with queuing, triggering phone calls with dial-on-demand routing (DDR), changing the administrative distance of routes, and specifying traffic to be protected by an IPSec VPN, among many others This chapter focuses on restricting the flow of traffic to or through a router
ACLs can be used for ltering of traf c through the IOS device
as well as remote access traf c to the IOS s VTY lines
De nition
ACLs are basically a set of commands, grouped together by a number or name, that are used to filter traffic entering or leaving an interface ACL commands define specifically which traffic is permitted and denied ACLs are created in Global Configuration mode
ACL Overview
Once you create your group of ACL statements, you must activate them For filtering traffic between interfaces, the ACL is activated in Interface Subconfiguration mode This can be a physical interface, such as ethernet0 or serial0, or a logical interface, such as ethernet01 or serial01 When activating an ACL on an interface, you must specify in which direction the traffic should be filtered:
Inbound (as the traffic comes into an interface from an external source) Outbound (before the traffic exits an interface to the network)
With inbound ACLs, the IOS compares the packet to the interface ACL before the IOS forwards it to another interface With outbound ACLs, the packet is received on an interface and forwarded to the exit interface; the IOS then compares the packet to the ACL One restriction that ACLs have is that they cannot filter traffic that the router itself originates For example, if you execute a ping or traceroute from the router, or if you telnet from the router to another device, ACLs applied to the router s interfaces cannot filter these connections outbound However, if an external device tries to ping, traceroute, or telnet to the router or through the router to a remote destination, the router can filter these packets
For inbound ACLs, the ACL is processed before any further processing by the IOS; with outbound ACLs, the packet is routed to the interface and then the
outbound ACL is processed ACLs applied outbound to interfaces cannot be used to lter traf c the IOS originates itself
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