
【名词&注释】
企业网(intranet)、文件扩展名(suffix name)、奇偶校验(parity check)、可变比特率(vbr)、文件类型(file type)、大多数(most)、标准子网掩码、恒定比特率(cbr)、文本文件。、邮箱地址(mailbox addresses)
[判断题]由于多数路由器本身就包含有分组过滤功能,从而使具有分组过滤功能的路由器成为第一代防火墙产品。()
查看答案&解析
举一反三:
[单选题]
B. 实时、可变比特率、面向连接
C. 非实时、恒定比特率(cbr)、五连接
D. 非实时、恒定比特率(cbr)、面向连接
A. 实时、恒定比特率(cbr)、面向连接B. 实时、可变比特率、面向连接
B. 非实时、恒定比特率(cbr)、五连接
C. 非实时、恒定比特率(cbr)、面向连接
[单选题]对8位代码10101101进行奇偶校验,正确的结果是(33)。
A. 经奇校验表明代码正确
B. 经偶校验表明代码正确
C. 经奇校验发现错误,但不能纠正
D. 经偶校验发现错误,但能纠正
[单选题]在Excel中,函数SUM(A1:B4)的含义是( )。
A. 计算A1与B4单元格中值的和
B. 计算A1到B4单元格中值的和
C. 按行计算A列和B列的和
D. 按列计算1、2、3、4行的和
[单选题]Windows系统中,用“记事本”程序编辑文字内容时,另存某文件后自动形成的文件扩展名是(34)。
A. doc
B. htm
C. xls
D. txt
[单选题]下面是一些Internet上常见的文件类型,(43)文件类型一般代表WWW页面文件。
A. htm或html
B. txt或text
C. gif或jPe8
D. wav或au
[多选题]●We have already covered the topic of network addresses. The first(71) in a block (in classes A,B,and C) defines the network address. In classes A,B,and C,if the hostid is all ls, the address is called a direct broadcast address. It is used by a (72) to send a packet to all hosts in a specific network. All hosts will accept a packet having this type of destination address. Note that this address can be used only as a (73)address in an lP packet. Note also that this special address also reduces the number of available hostid for each netid in classes A,B,and C.In classes A,B,and C,an address with all Is for the netid and hostid (32 bits) defines a( 74) address in the current network.A host that wants to send a message to every other host can use this address as a destination address in an IP packet. However,a router will block a packet having this type ofaddress to confine the broadcasting to the (75) network. Note that this address belongs to class E.
A. datagram
B. function
C. address
D. service
E. router
F. switch
G. hub
H. firewall
I. source
J. destination
K. local
L. remote
M. unicast
N. multicast
O. broadcast
P. anycast
Q. neighbor
R. next
S. remote
T. local
[单选题]某企业网内部使用的地址块是10.168.192.0/27,该企业网每个子网可分配的主机地址数是(28)台。
A. 30
B. 32
C. 62
D. 64
[单选题]
B. 相继竞争发送权
C. 接收到阻塞信号
D. 有可能继续发送数据
A. 处于待发送状态B. 相继竞争发送权
B. 接收到阻塞信号
C. 有可能继续发送数据
[多选题]匿名登录FTP服务器使用的账户名是 ______ 。
A. anonymous
B. anyone
C. everyone
D. Guest
E.
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