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5 A There are 3 port states in RSTP: discarding, learning, and forwarding Since there are only 3 states, B, C, and D are incorrect 6 C An alternate port has the second best path to the root switch A is the best path to the root B is the best path for a segment to the root D is the second best path for a segment to the root 7 A The spanning-tree mode rapid-pvst command enables RSTP with PVST+ on a Catalyst switch state is an invalid parameter, making B incorrect C is an invalid command D has an invalid mode parameter
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8 C Ports must be configured identically to form a channel A is incorrect because you can have up to eight ports in a channel B is incorrect because the limit is six channels per switch D rapidly converges STP: PAgP and LACP dynamically form channels
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9 B If you have a layer 2 loop, the switch s CPU and/or port utilization will be very high A is true only if you are seeing duplicate broadcast/multicast frames, not just a high number of these C would be indicative of a physical layer problem such as a cable issue Port address tables would be constantly updated with correct and incorrect information, making D incorrect 10 B When using a protocol analyzer to troubleshoot layer 2 loop problems, look for the same frame being repeated constantly A will show an inordinate amount of statistical traffic on the interface, but it doesn t clarify it as broadcast or part of a loop C is an invalid command D is used to troubleshoot layer 3, not layer 2, problems
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Part IV
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CHAPTERS
15 16 Routers and Routing Initial Router Configuration 17 18 Remote Device Management Security Device Manager (SDM)
Copyright 2008 by The McGraw-Hill Companies Click here for terms of use
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Routers and Routing
CERTIFICATION OBJECTIVES
1501 1502 1503 Routing Introduction Dynamic Routing Protocols Distance Vector Protocol Problems and Solutions
Two-Minute Drill Self Test
Copyright 2008 by The McGraw-Hill Companies Click here for terms of use
15: Routers and Routing
he preceding part of the book focused on switches and protocols that function at layer 2 This part of the book moves up one layer in the OSI Reference Model to discuss layer 3, the network layer Layer 3 devices are generically called routers Routers basically have two functions:
To find a layer 3 path to a destination network To move packets from one interface to another to get a packet to its destination
To accomplish the first function, a router will need to do the following:
Learn about the routers to which it is connected to determine the networks
that are reachable
Find locations of destination network numbers Choose a best path to each destination Maintain the most up-to-date routing information about how to reach
destination networks
You should know the functions of routers: they learn about neighboring routers, nd and choose the
best paths to destinations, and maintain up-to-date reachability information
To accomplish the second function, a router will need to examine the destination IP address in an incoming IP packet, determine the network number of the destination, look in its routing table, and switch the packet to an outgoing interface As you will see in this chapter, the routing table contains a list of destination network numbers, the status of these networks, which interface the router should use to reach the Remember that routers destination, and which neighboring router the must determine the network number of router should use if the destination is more than the destination in the destination eld of one hop away This chapter introduces routing the IP header and nd the corresponding and the types of dynamic routing protocols: network in the routing table to route the distance vector, link state, and hybrid protocols packet
Routing Introduction
CERTIFICATION OBJECTIVE 1501
Routing Introduction
Before a discussion of routers and routing protocols begins, you need a fundamental understanding of the types of routes that can exist on a router and how a router uses routes that it learns The following sections discuss two learning methods (static and dynamic), how routers are grouped together (autonomous systems), and how routing protocols are weighed by the router when choosing a path between multiple routing protocols
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