下面的問題將幫助你評價(jià)你在本章中學(xué)習(xí)到的內(nèi)容。仔細(xì)閱讀所有的選項(xiàng),因?yàn)檎_答案可能多于1個(gè)。選擇每個(gè)問題中所有的正確答案。
1) the service provided by ipx is (ipx提供的服務(wù)是):
a. guaranteed delivery
b. datagram
c. connection-oriented
d. sequenced
2) the transport control field in the ipx header holds what information? (ipx報(bào)頭中的傳輸 控制字段保留何種信息)?
a. the age of the packet.
b. protocol type
c. router hop count
d. level of service required.
3) what is the length of an ipx network number (ipx網(wǎng)絡(luò)編號的長度是多少)?
a. 16 bits
b. variable
c. 48 bits
d. 32 bits
4) in the ipx address 0102.0000.8045.1700, what is the node address ( 在i p x地址 0 1 0 2 . 0 0 0 . 8 0 4 5 . 1 7 0 0中,節(jié)點(diǎn)地址是多少)?
a. 1700
b. 0102.0000.8045
c. 0102.0000
d. 0000.8045.1700
5) what can you say about this address: 47.0000.0000.0001 (關(guān)于這個(gè)地址 4 7 . 0 0 0 0 . 0 0 0 0 . 0 0 0 1,你可以說):
a. it is the address of a netware print server
b. it is an internal network address
c. the included socket number is 0001
d. nothing
6) the checksum field in the ipx header is normally set to (ipx報(bào)頭中的校驗(yàn)和字段通常設(shè)置為):
a. a checksum of the entire ipx packet
b. a checksum of the ipx header fields only
c. 0xffff
d. 0
7) if an ipx node is configured to use the ethernet_802.2 encapsulation, which other machines can it communicate with directly (without going through a router) on the same network (如果一個(gè)i p x節(jié)點(diǎn)配置為使用e t h e r n e t _ 8 0 2 . 3封裝,它可以和相同網(wǎng)絡(luò)上其他哪一個(gè)設(shè)備直接通信(不經(jīng)過路由器) )?
a. machines running any encapsulation
b. machines running either ethernet_802.2 or ethernet_802.3
c. machines running ethernet_ii
d. machines running ethernet_802.2
8) to run multiple encapsulations on a single physical interface, a router has to (為在一個(gè)物理接口上運(yùn)行多個(gè)封裝,路由器必須):
a. use a different network number for each encapsulation
b. use subinterfaces, not secondary networks
c. enable nlsp routing
d. use an access list
9) which protocol does a workstation use to locate a server providing a particular type of service (工作站使用哪一個(gè)協(xié)議來找到提供特定類型服務(wù)的服務(wù)器)?
a. rip
b. ncp
c. sap
d. eigrp
10) periodic sap updates are sent by (定期s a p更新由誰發(fā)出):
a. routers and servers
b. netware servers only
c. workstations and routers
d. workstations only
11) the rip protocol is used by (rip協(xié)議由誰使用)?
a. routers only
b. servers only
c. workstations, servers, and routers
d. print servers
12) which command which must be given first to enable ipx (在啟用i p x時(shí),必須首先給出哪一個(gè)命令)?
a. cisco(config)#enable ipx routing
b. cisco>ipx routing
c. cisco(config-if)#ipx routing on
d. cisco(config)#ipx routing
13) which of the following allow you to use multiple ipx networks on a single physical interface (下面哪一個(gè)允許你在單個(gè)物理接口上使用多個(gè)i p x網(wǎng)絡(luò))?
a. secondary networks
b. dynamic frame types
c. subinterfaces
d. none. this is not supported.
14) which ios command allows you to view the router’s internal sap database (哪一個(gè)i o s 命令允許你查看路由器的內(nèi)部s a p數(shù)據(jù)庫)?
a. show serv e r s
b. show ipx servers
c. servers
d. ipx servers
15) which of the following kinds of information do you need to collect before you can configure ipx using ios (你需要在用i o s配置i p x之前搜集下面各種信息中的哪一個(gè))?
a. the number of netware servers on the network
b. the encapsulations in use
c. ipx network numbers
d. the ipx address of another router
16) what does this command do:
cisco(config-if)#ipx network 3 (這個(gè)命令的作用是什么: c i s c o ( c o n f i g -
if)#ipx network3):
a. nothing. it is incomplete.
b. sets up a static route to network 3
c. configures ipx network 3 on this interface with the default frame type
d. nothing. the router is in the wrong configuration mode.
17) what does this ios command do?
ipx route 4 5.0000.8004.4563 float i n g - s tatic (這個(gè)i o s命令的作用是什么i p x route 45.0000.8004.4563 float i n g - s tat i c )?
a. configures 4 static routes
b. configures static sap entries for servers of type 4
c. configures a static route to network 4
d. says that to get to network 5, you must go via network 4
18) in the command ipx route 4 5.0000.8004.4563 float i n g - s tatic, what does the f l o at i n g - s tatic keyword on the end mean? ( 在命令ipx route 45.0000.8004.4563
f l o at i n g.s tat i c中,最后的f l o at i n g.s tat i c意味著什么)?
a. set all static routes to floating
b. allow this route to be overridden by a route received dynamically
c. apply this route to all network numbers from 1 to 4
d. lock this route so that it cannot be changed
19) the ipx maximum-paths command does what (ipx maximum.pat h s命令的作用是什么)?
a. allows ios to share traffic to a given network over multiple paths
b. allows a slow link to be used as a backup for a faster one
c. sets the maximum number of router hops a packet can travel
d. sets the maximum number of interfaces ipx can be configured on
20) which command is used to show a concise list of the configured ipx interfaces (哪一個(gè)命令用于顯示配置的i p x接口上的簡明列表)?
a. show config
b. show ipx interface
c. show ipx interface brief
d. show interface
21) if two devices are plugged into the same physical network, but are using diff e r e n t encapsulations, what it required before they can communicate (如果在相同的物理網(wǎng)絡(luò)中加入了兩個(gè)設(shè)備,但是使用不同的封裝,在它們通信之前需要完成什么)?
a. a cross-over cable
b. a repeater
c. a router configured for the appropriate encapsulations
d. nothing. they can communicate directly.
22) when does a workstation normally send a gns request (工作站一般在什么時(shí)候發(fā)出g n s請求)?
a. when trying to communicate with another workstation
b. when trying to locate the nearest router
c. when it needs to send a sap update
d. when trying to locate a server at initialization
23) how many router hops does a gns request travel (一個(gè)g n s請求經(jīng)過多少個(gè)路由器跳)?
a. 16
b. none
c. 4
d. unlimited
24) in a sap update packet, what does the server address field contain (在s a p更新數(shù)據(jù)包中,服務(wù)器地址字段中包含什么)?
a. the network the server is on
b. the server’s node number
c. the socket number the server is listening on
d. all of the above.
25) which of the following protocols is used by servers to advertise their services to the clients (下面協(xié)議中的哪一個(gè)由服務(wù)器使用,以向客戶通告它們的服務(wù))?
a. routing information protocol (rip)
b. sequenced packet exchange (spx)
c. network core protocol (ncp)
d. service advertising protocol (sap)
26) on an ethernet lan how many ipx encapsulation types are supported (在一個(gè)e t h e r n e t局域網(wǎng)上,可以支持多少個(gè)i p x封裝)?
a. 4
b. 3
c. 2
d. 1
27) the frame check sequence checks with which fields in an ethernet_802.3 frame (幀校驗(yàn)序列校驗(yàn)e t h e r n e t - 8 0 2 . 3幀中的哪一個(gè)字段)?
a. the source address and destination addres
b. the packet data
c. everything from the destination address on
d. source service access point (ssap)
28) which of the following fields is not common to both ethernet_802.3 and ethernet_802.2 frames (下面字段中的哪一個(gè)不是e t h e r e n e t 8 0 2 . 3和e t h e r n e t 8 0 2 . 3幀所共有的)?
a. source address
b. length
c. dsap
d. data
29) in sap packets, the numbers in the service type field are assigned by (在一個(gè)s a p數(shù)據(jù)包中,服務(wù)類型字段中的數(shù)字由誰給定)?
a. the system administrator
b. the end user
c. novell
d. server
30) sap requests, responses, or broadcasts can be recognized by which value of source or destination socket number (sap請求,響應(yīng)或廣播可以通過源或目的套接字?jǐn)?shù)字中的哪一個(gè)值來識別)?
a. 0x0452
b. 0xe0
c. 0x03
d. 0x0453
31) in rip packets, the hops away and time ticks fields are valid both for request and response packets (在r i p數(shù)據(jù)包中,“跳距離”和“時(shí)間嘀嗒數(shù)”字段對于請求和響應(yīng)數(shù)據(jù)包都是合法的)。
a. true
b. false
32) up to how many rip entriescan a single ipx packet hold (一個(gè)i p x數(shù)據(jù)包可以保留多少個(gè)r i p條目)?
a. 44
b. 47
c. 49
d. 51
33) in rip, which number of hop counts indicates that a network is unreachable (在r i p中,多少個(gè)跳距離表示無法達(dá)到一個(gè)網(wǎng)絡(luò))?
a. 12
b. 16
c. 8
d. 20
34) match a novell term on the left with an ios term on the right (匹配左邊的n o v e l l術(shù)語和右邊的i o s術(shù)語)。
a. ethernet_snap 1. sap
b. ethernet_802.2 2. snap
c. ethernet_ii 3. novell-ether
d. ethernet_802.3 4. arpa
35) if a user attempts to set the same encapsulation type on more than one subinterface on the same physical interface, what will the ios do (如果一個(gè)用戶企圖在相同物理接口的多個(gè)子接口上設(shè)置相同的封裝類型, i o s將給出什么結(jié)果)?
a. assign default values for encapsulation types
b. issue a warning but allow the change
c. issue an error message and ignore the change
d. allow the change
36) which of the following is a default routing protocol when ipx routing is enabled (下面的哪一個(gè)是啟用i p x路由時(shí)的默認(rèn)路由協(xié)議)?
a. rip
b. nlsp
c. eigrp
d. cdp
37) when there are multiple paths available at the same cost, then by default ios: (當(dāng)存在代價(jià)相同的多個(gè)路徑時(shí),在默認(rèn)情況下):
a. will keep all paths in the routing table
b. will keep only one path in the routing table
c. will keep all paths in the table and route the traffic in a round-robin manner
d. b and c
38) what is the purpose of the split-horizon function (水平分割的目的是什么)?
a. to divide the network traffic in two for faster throughput
b. to avoid sending redundant data back out the interface it was received on
c. so that each person only has to manage half the routers on a network
d. to set traffic priority levels
39) by default, rip routers broadcast periodic updates every (默認(rèn)情況下,r i p路由器每隔多長時(shí)間進(jìn)行廣播)?
a. 30 seconds
b. 60 seconds
c. 5 minutes
d. 10 minutes
40) when would a workstation send a rip request (何時(shí)一個(gè)工作站會發(fā)送r i p請求)?
a. on initialization, to locate a server
b. whenever it needs to find a route to a remote network it doesn’t have a route for
c. to connect to a netware server
d. every 60 seconds
41) if an interface was configured like this:
c i s c o ( c o n f i g ) # i n t e r face ethernet 1
cisco(config-if)#ipx network 201 encapsulation novell-ether
cisco(config-if)#ipx network 202encapsulation sap secondary
how many copies of each sap update would be sent out the physical interface (如果一個(gè)接口這樣配置:
c i s c o ( c o n f i g ) # i n t e r fa c e
e t h e r n e t 1
cisco(config-if)#ipx network
201 encapsulat i o n
n o v e l l - e t h e r
cisco(config-if)#ipx network
202 encapsulation sap
s e c o n d a ry
則在物理接口上可以發(fā)出s a p更新的多少個(gè)副本)
a. 1
b. 2
c. 3
d. 4
a.7 第7章答案
1) b。i p x僅僅提供了不可靠的、無連接數(shù)據(jù)報(bào)服務(wù)。
2) c。i p x報(bào)頭中的傳輸控制字段控制路由器跳計(jì)數(shù)信息。當(dāng)數(shù)據(jù)包生成時(shí),傳輸控制字段初始化為0,并且在它每次通過路由器時(shí)都增加。
3) d。盡管通常網(wǎng)絡(luò)號開頭的0都省略掉,但是網(wǎng)絡(luò)號是一個(gè)長度為3 2的數(shù)字。
4) d。節(jié)點(diǎn)地址是0 0 0 0 . 8 0 4 5 . 1 7 0 0。i p x地址總是以網(wǎng)絡(luò)號開始,然后是節(jié)點(diǎn)地址。有時(shí)再加上套接字號。
5) b。它是一個(gè)內(nèi)部網(wǎng)絡(luò)地址。服務(wù)器總是內(nèi)部網(wǎng)絡(luò)上的節(jié)點(diǎn)0 0 0 0 . 0 0 0 0 . 0 0 0 1。
6) c 。默認(rèn)情況下不使用i p x報(bào)頭中的校驗(yàn)和字段。生成數(shù)據(jù)包時(shí),該字段設(shè)置為0 x f f f f。
7) d。要直接通信,節(jié)點(diǎn)必須運(yùn)行相同的幀類型。
8) a。接口上使用的每個(gè)封裝組成了它自己的i p x網(wǎng)絡(luò),所以必須給它網(wǎng)絡(luò)號。每個(gè)網(wǎng)絡(luò)號必須是i p x互連網(wǎng)絡(luò)上唯一的編號。
9) c。工作站使用服務(wù)通告協(xié)議( s a p )來定位提供特殊服務(wù)類型的服務(wù)器。
10) a。路由器和服務(wù)器定期發(fā)送s a p更新。所有服務(wù)器使用廣播通告可用的服務(wù)。路由器記錄這些通告,并且將通告作為s a p數(shù)據(jù)庫的一部分來重新通告。工作站僅僅廣播g n s查詢,它從來不傳輸更新。
11) a.工作站、服務(wù)器和路由器都使用r i p在遠(yuǎn)程網(wǎng)絡(luò)中定位路由。
12) d。首先執(zhí)行命令ipx routing來啟用i p x。盡管答案b有正確的命令,但是路由器是以錯(cuò)誤的模式接受的。
13) a,c。次級網(wǎng)絡(luò)和子接口都允許用戶在物理接口上有多個(gè)i p x網(wǎng)絡(luò)。不過,接口上的每個(gè)網(wǎng)絡(luò)必須在不同的封裝上運(yùn)行。
14) b 。命令show ipx serv e r s允許用戶查看路由器的內(nèi)部s a p數(shù)據(jù)庫。此時(shí)將顯示s a p表的內(nèi)容。
15) b ,c。如果要在安裝中避免問題,那么使用的封裝和i p x網(wǎng)絡(luò)號是必要的。
16) c。因?yàn)闆]有指定封裝,所以該接口使用默認(rèn)介質(zhì)類型。
17) c。配置到網(wǎng)絡(luò)4的靜態(tài)路由。5 . 0 0 0 0 . 8 0 0 4 . 4 5 6 3是到網(wǎng)絡(luò)4的下一跳的路由器。
18) b。末端的關(guān)鍵字f l o at i n g - s tat i c含義是,如果r i p通告的路由或者網(wǎng)絡(luò)4接收另一個(gè)路由選擇協(xié)議,那么它將優(yōu)先于靜態(tài)路由。如果不是這樣,那么該網(wǎng)絡(luò)進(jìn)入的動態(tài)路由將要忽略掉。
19) a。命令ipx maximum-pat h s允許到給定網(wǎng)絡(luò)的多個(gè)路徑。路徑必須具有相同的代價(jià)。默認(rèn)情況下, i o s僅僅有一條通向每個(gè)目標(biāo)網(wǎng)絡(luò)的路徑。
20) c 。命令show ipx interface brief顯示了所配置的i p x接口的簡明列表。盡管答案b顯示了列表,但是它并不是簡明的。
21) c。如果它們沒有運(yùn)行相同的封裝, 那么路由器是唯一可以和它們連接的設(shè)備。
22) d。當(dāng)工作站首先出現(xiàn)時(shí),它需要查找要連接的n e t wa r e服務(wù)器。一旦連接成功,它就可以使用服務(wù)器數(shù)據(jù)庫來定位服務(wù)器。
23) b。g n s請求是一個(gè)廣播。默認(rèn)情況下,路由器阻塞這些廣播,所以它們僅僅在本地網(wǎng)絡(luò)中可見。
24) d 。s a p更新包括帶有服務(wù)器套接字號的完整的互連網(wǎng)絡(luò)地址。
25) d。s a p通告是通告服務(wù)信息的服務(wù)器所發(fā)出的廣播。
26) a。ethernet lan支持的i p x封裝的四種類型分別是: e t h e r n e t _ i i,e t h e r n e t _ 8 0 2 . 2,
e t h e r n e t _ 8 0 2 . 3和e t h e r n e t _ s n a p。
27) c 。f c s用來檢測破壞的數(shù)據(jù)包,并且檢查所有的i p x數(shù)據(jù)包字段。
28) c 。d s a p字段在e t h e r n e t _ 8 0 2 . 2幀中,它不是在e t h e r n e t _ 8 0 2 . 3幀中。
29) c 。“服務(wù)類型”字段包括n o v e l l分配的號。
30) a 。s a p請求、響應(yīng)或者廣播可以為0 x 0 4 5 2的源和目標(biāo)套接字號所識別。d s a p和s s a p字段中的e t h e r n e t _ 8 0 2 . 2版使用0 x e 0。0 x 0 3是e t h e r n e t _ 8 0 2 . 2幀中的控制位組的數(shù)值。 0 x 0 4 5 3用作r i p幀中的套接字號。
31) b。錯(cuò)誤。在r i p請求中,兩個(gè)字段都包括數(shù)值0 x f f f f。在響應(yīng)數(shù)據(jù)包中,它們包括合法的數(shù)值。
32) c 。單個(gè)i p x數(shù)據(jù)包可以控制至多4 9個(gè)r i p條目。
33) b 。在r i p中,1 6的路程段數(shù)說明網(wǎng)絡(luò)是不可達(dá)的。
34) a-2,b - 1,c - 4,d - 3。這些對應(yīng)在表7 - 1中列出。
35) c。如果用戶試圖在相同物理接口上的多個(gè)子接口上設(shè)置相同的封裝類型,那么i o s將發(fā)出錯(cuò)誤信息并且忽略改動。
36) a 。在i p x啟用時(shí),r i p是默認(rèn)的路由選擇協(xié)議。
37) b。默認(rèn)情況下, i o s僅僅使用通向每個(gè)網(wǎng)絡(luò)的最佳路徑,并且沿該路徑發(fā)送所有的通信量。
38) b。水平分割的用途是避免冗余。沒有將s a p條目發(fā)送回最初接收它們的網(wǎng)段中,該網(wǎng)段的通信信息量減少,并且避免了混亂的循環(huán)。
39) b。默認(rèn)情況下,每隔6 0秒發(fā)送一次r i p更新。
40) b。工作站使用r i p定位遠(yuǎn)程網(wǎng)絡(luò)中的路由。
41) b。發(fā)送每個(gè)s a p更新的兩個(gè)副本:一個(gè)發(fā)送到n o v e l l - e t h e r封裝的網(wǎng)絡(luò)2 0 1,另一個(gè)發(fā)送到s a p封裝上的網(wǎng)絡(luò)2 0 2。