下面的问题将帮助你评价在本章中学习到的内容。仔细阅读所有的选项，因为正确答案可能多于1个。选择每个问题中所有的正确答案。
1) Company A has recently merged with Company B, which exists in the same building and is physically close enough for all the computers to belong on the same network seg ment.
Company A uses an ATM backbone and Fast Ethernet for all nodes. Company B has a Token Ring environment on shielded twisted-pair wiring. Why will Company A and Company B select a router for their newly merged network (公司A最近合并了公司B，它们位于同一座大楼中，并且所有的计算机足够接近，可以属于同一个跳。公司A在所有的节点上使用AT M主干和快速E t h e r n e t公司B使用屏蔽双绞线基础上的令牌环网环境。为什么公司A和公司B为它们新的合并网络选择了路由)？
A. Network segment size has reached the maximum
B. Network addresses are not sufficient for a merged network
C. Tr a ffic must be segmented to prevent an expected bandwidth overload
D. A router is the usual way to connect dissimilar network types
2) What are the two basic mechanisms that make up a routing protocol (构成路由选择协议的两个基本机制是什么)？
A. Route selection
B. Flooding
C. Autonomous Systems
D. Data Tr a n s m i s s i o n
3) What is a routing table used for (路由选择表的用途是什么)？
A. It is the physical support for the router to sit on
B. It contains a list of all the timers used to prevent routing loops
C. It is used to select the best route
D. It manages the periodic update algorithm
4) What types of information can be found in different types of routing protocol routing tables (在不同类型的路由选择协议路由表中可以发现何种类型的信息)？(select 3)
A. The destination network associated with the next hop
B. The destination network associated with the cost metric
C. The destination network associated with the subnet mask
D. The destination network associated with the next path or interface to use
5) What is a routing update used for (路由选择更新的用途是什么)？
A. Routing updates notify neighboring routers with a 呼叫
B. Routing updates redistribute routes learned from other routing protocols
C. Routing updates maintain the routing table
D. Routing updates increase the network addresses available by changing the subnet masks
6) When a node on one network sends a packet to a node on another segment that is three
hops away, what addresses are included in the initial addressing of that packet (select 2) (当网络上的节点向另一个跳3个跳上的节点发送信息表时，在那个信息表的初始地址中包含了什么地址)？
A. The network address of the router
B. The MAC layer address of the router
C. The network address of the destination node
D. The MAC layer address of the destination node
7) What are three objectives for a routing protocol (路由选择协议的3个目标是什么)？
A. Accuracy
B. Quick holddowns
C. Rapid Convergence
D. Low overhead
8) Define convergence (定义收敛)。
A. Convergence is the updates that are triggered by network changes
B. Convergence is the process of sending 呼叫packets
C. Convergence is two routers merging their routing tables into one
D. Convergence is the synchronizing of all routing tables on the internetwork, or simply the synchronization of a single route change across all routers.
9) Why are dynamic routing protocols considered dynamic (为什么动态路由选择协议考虑动态)？
A. Because each route is dynamically selected for each packet with a destination network not attached to the router。
B. Because new routes are dynamically recomputed whenever there is a change in the nternetwork topology
C. Because convergence happens faster
D. Because all the routes remain the same no matter what changes happen on the network
10) What is a static route (什么是静态路由)？
A. A static route is one that has been manually entered into the routing table and is not updated by a routing protocol
B. A static route is one that is recomputed whenever a change is made on the internetwork
C. A static route is one that is redistributed when it has been learned by another routing protocol
D. A static route is one that comes already configured in the router from the manufacturer
11) What type of network is best when using static routes (当使用静态路由时，何种类型的网络是最好的)？
A. A large network with hundreds of routers and networks
B. A complex internetwork that changes often
C. An autonomous system with multiple connections to other autonomous systems
D. A small network with few routers and infrequent changes
12) What is an autonomous system (什么是自治系统)？
A. An area
B. A domain
C. A contiguous set of routers defined within a larger internetwork, that do not share routing information with the external internetwork
D. All of the above
E. None of the above
13) What is a default route (什么是默认路由)？
A. A type of static route
B. A destination for any nonroutable packet
C. Gateway of last resort
D. All of the above
E. None of the above
14) What type of information does a distance vector router build its routing table with (距离向量路由器用何种类型的信息来建立它的路由选择表)？
A. 呼叫packets
B. Second-hand information
C. LSPs
D. First-hand information
15) What is the count to infinity problem (什么是无限计数问题)？
A. A routing loop that results from the way distance vector protocols use second-hand information
B. The inability of routers to process more than 16 hops
C. The excessive CPU overhead presented by distance vector algorithms
D. The result of using both RIP and IGRP on the same internetwork
16) What is poison reverse (什么是破坏逆转)？
A. A change to the default update period timer
B. A routing loop that occurs when using second-hand information to update route tables
C. A router virus
D. A version of split-horizon that sends back a “route unreachable” update to the router that the route was learned from, in order to avoid routing loops
17) What is RIP (什么是R I P )？
A. RIP is an older distance vector Interior Gateway Protocol with a 30-second update timer and . maximum of 15 hops (where “i n f i n i t y” is 16 hops)
B. RIP is a new link-state protocol created by Cisco
C. RIP is a proprietary protocol created by Cisco that has two versions; only version 2 is used currently
D. RIP is a distance vector Interior Gateway Protocol with a 224 maximum network diameter (maximum 224 hops)
18) What is IGRP (什么是I G R P )？
A. IGRP is an older distance vector Interior Gateway Protocol with a 30-second update timer and a maximum of 15 hops (where infinity is 16 hops)
B. IGRP is a new link-state protocol created by Cisco
C. IGRP is a proprietary protocol created by Cisco that has two versions; only version 2 isused currently
D. IGRP is a distance vector and Interior Gateway Protocol with a 224 maximum network diameter (maximum 224 hops)
19) What is the purpose of a flash update in IGRP (IGRP中的瞬时更新的目的是什么)？
A. A flash update is a standard 90-second update
B. After three flash updates, a route is considered unreachable
C. A flash update is sent immediately upon a change in the network topology, in order to speed convergence
D. After seven flash updates, a route is removed from the routing table
20) How can the administrator change how IGRP selects routes (管理员如何修改I G R P选择路由的方法)？
A. The administrator can set update timers
B. The administrator can enable or disable split horizon
C. The administrator can set up load balancing across redundant routes
D. The administrator can adjust the metric weights used for determining the route selection
21) The way to get traffic from one segment of the network to another segment is (在网段之间进行通信的方法是)：
A. Bridging
B. Routing
C. Switching
D. All of the above
22) Routing occurs at which layer (路由发生在哪一层)？
A. Physical layer
B. Data link layer
C. Network layer
D. Transport layer
23) In general, the bets route selected by a router is one with (一般而言，路由器选择的最佳路由具有何种特性)？
A. Least cost
B. Shortest distance
C. Lowest metric value
D. None of the above
24) A routing table typically includes which of the following (路由表通常包含下列的哪些信息)？
A. Destination network address
B. The total number of networks
C. The number of nodes in each network
D. The total number of routers in a network
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