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網(wǎng)絡(luò)工程師每日一練試題內(nèi)容(2024/3/8)
試題1
某校園網(wǎng)的地址是202.100.192.0/18,要把該網(wǎng)絡(luò)分成30個(gè)子網(wǎng),則子網(wǎng)掩碼應(yīng)該是 (1) ,每個(gè)子網(wǎng)可分配的主機(jī)地址數(shù)是 (2) 。
(1)A、255.255.200.0
B、255.255.224.0
C、255.255.254.0
D、255.255.255.0
(2)A、32
B、64
C、510
D、512
查看答案
試題參考答案:C、C
試題2
下面關(guān)于RS-232-C標(biāo)準(zhǔn)的描述中,正確的是( )。查看答案
試題參考答案:B
試題3
DNS通知是一種推進(jìn)機(jī)制,其作用是使得( )。查看答案
試題參考答案:A
試題4
下面說法中,能夠?qū)е?BGP 鄰居關(guān)系無法建立的是()。查看答案
試題參考答案:A
試題5
網(wǎng)絡(luò)系統(tǒng)設(shè)計(jì)過程中,邏輯網(wǎng)絡(luò)設(shè)計(jì)階段的任務(wù)是( )。查看答案
試題參考答案:D
試題6
三層網(wǎng)絡(luò)設(shè)計(jì)方案中,( )是核心層的功能。查看答案
試題參考答案:A
試題7
在E1載波中,每個(gè)子信道的數(shù)據(jù)速率是 (1) ,E1載波的控制開銷占 (2) 。
(1)A、32 kb/s
B、64 kb/s
C、72 kb/s
D、96 kb/s
(2)A、3.125 %
B、6.25 %
C、1.25%
D、25%
查看答案
試題參考答案:B、B
試題8
The TCP protocolis a (1) layer protocol. Each connection connects two TCPs that may be just one physical network apart or located on opposite sides ofthe globe. In other words, each connection creates a (2) witha length that may be totally different from another path created by another connection. This means that TCP cannot use the same retransmission time for all connections. Selecting afixed retransnussion time for all connections can result in serious consequences. Ifthe retransmission time does not allow enough time for a (3) to reach the destination and an acknowledgment to reach the source, it can result in retransmission of segments that are still on the way. Conversely, if the retransnussion time is longer than necessary for a short path, it may result in delay for the application programs.Even for one single connection, the retransmission time should not be fixed.A connection may be able to send segments and receive (4)faster during nontraffic period than during congested periods. TCP uses the dynamic retransmission time,a transmission time is different for each connection and which may be changed during the same connection. Retransmission time can be made(5) by basing it on the round-trip time (RTT). Several formulas are used for this purpose.
(1)A、physical
B、network
C、transport
D、application
(2)A、path
B、window
C、response
D、process
(3)A、process
B、segment
C、program
D、user
(4)A、connections
B、requests
C、acknowledgments
D、datagrams
(5)A、long
B、short
C、fixed
D、dynamic
查看答案
試題參考答案:C、A、B、C、D
試題9
主機(jī)甲和主機(jī)乙建立一條 TCP 連接,采用慢啟動(dòng)進(jìn)行擁塞控制,TCP最大段長度為 1000字節(jié)。主機(jī)甲向主機(jī)乙發(fā)送第 1 個(gè)段并收到主機(jī)乙的確認(rèn),確認(rèn)段中接收窗口大小為 3000字節(jié),則此時(shí)主機(jī)甲可以向主機(jī)乙發(fā)送的最大字節(jié)數(shù)是()字節(jié)。查看答案
試題參考答案:B
試題10
關(guān)于路由器,下列說法中正確的是 ( ) 。
A、路由器處理的信息量比交換機(jī)少,因而轉(zhuǎn)發(fā)速度比交換機(jī)快
B、對(duì)于同一目標(biāo),路由器只提供延遲最小的最佳路由
C、通常的路由器可以支持多種網(wǎng)絡(luò)層協(xié)議,并提供不同協(xié)議之間的分組轉(zhuǎn)換
D、路由器不但能夠根據(jù)邏輯地址進(jìn)行轉(zhuǎn)發(fā),而且可以根據(jù)物理地址進(jìn)行轉(zhuǎn)發(fā)
查看答案
試題參考答案:C
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