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Most IP layer-based proxy mechanisms,such as network address translation (NAT),only supportuni-directional proxy,from the internal network to external network(the Interned.The proxvestablishes the communication channel by (71) IP addresses.The IP addresse

题目

Most IP layer-based proxy mechanisms,such as network address translation (NAT),only supportuni-directional proxy,from the internal network to external network(the Interned.The proxvestablishes the communication channel by (71) IP addresses.The IP addresses must be (72) .These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels,such as,multimedia applications.IP layer-based proxy mechanisms need additional software (73) for each application that uses (74) channels. SOCKS identifies communication targets through domain names,overcoming the restriction of Usina private IP addresses.SOCKS can use domain names to establish communication between separate LANs,with (75) IP addresses.

(66)

A.manufacturing

B.manipulating

C.conduct

D.implement


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更多“Most IP layer-based proxy mechanisms,such as network address translation (NAT),only suppor ”相关问题
  • 第1题:

    TheBGProutingtableconsistsofthefollowingnetworkroutes:Whatisthecorrectcommandtosummarizetheseprefixesintoasinglesummaryprefixof192.168.12.0/22whilealsoallowingfortheadvertisementofthemorespecificprefixes?()

    A.network192.168.12.0mask255.255.252.0

    B.network192.168.12.0mask0.0.3.255

    C.network192.168.12.0

    D.aggregate-address192.168.12.0255.255.252.0

    E.aggregate-address192.168.12.0255.255.252.0summary-only

    F.aggregate-address192.168.12.0255.255.252.0as-set


    参考答案:D

  • 第2题:

    配置DHCP服务器IP地址池的地址为193.45.98.0/24,其中193.45.98.10~193.45.98.30用做静态地址分配,正确的配置语句是______。

    A.ip dhcp excluded-address 193.45.98.10.193.45.98.30 network 193.45.98.0 255.255.255.0

    B.ip dhcp excluded-address 193.45.98.10.193.45.98.30 network 193.45.98.0/24

    C.ip dhcp excluded-address 193.45.98.10 193.45.98.30 network 193.45.98.0 0.0.0.255

    D.ip dhcp excluded-address 193.45.98.10 193.45.98.30 network 193.45.98.0 255.255.255.0


    正确答案:D
    解析:本试题中,地址块“193.45.98.0/24”的“/24”是子网掩码255.255.255.0的简化表达形式。在DHCP Pool配置模式下,使用命令networknetwork-number>[mask|/prefix-length]配置分配给DHCP客户的有效IP地址池的子网地址和子网掩码。其中,子网掩码参数允许以点分十进制数、掩码前缀长度两种形式表达。因此,DHCP服务器IP地址池的地址为193.45.98.0/24的配置语句,如下所示:
      Router (dhcp-config)# network l93.45.98.0 255.255.255.0
      或:
      Router (dhcp-eonfig)# network 193.45.98.0/24
      在全局配置模式“Router(config)#”下,使用命令ip dhcp excluded-address low-address [high-address]将所要保留的IP地址从预定义的IP地址池中排除,使之成为不能动态分配的IP地址。若将IP地址池中 193.45.98.10~193.45.98.30用做静态地址分配,则相关的配置语句如下:
      Router (confiq)#ip dhcp excluded-address 193.45.98.10 193.45.98.30
      本试题选项A、选项B、选项C的配置语句,分别存在不符合以上两条命令的语法格式。

  • 第3题:

    配置DHCP服务器IP地址池的地址为193.45.98.0/24,其中193.45.98.10至193.45.98.30用作静态地址分配,正确的配置语句是

    A.ip dhcp excluded-address 193.45.98.10,193.45.98.30 network 193.45.98.0 255.255.255.0

    B.ip dhcp excluded-address 193.45.98.10,193.45.98.30 network 193.45.98.0 /24

    C.ip dhcp excluded-address 193.45.98.10 193.45.98.30 network 193.45.98.0 0.0.0.255

    D.ip dhcp excluded-address 193.45.98.10 193.45.98.30 network 193.45.98.0 255.255.255.0


    正确答案:D
    P187

  • 第4题:

    WhichoptiondescribesthedefaultrolesavailabletoRBAConCiscoNexusswitches?()

    A.admin,operator,network-admin,andnetwork-operator

    B.admin,read-only,network-admin,andnetwork-operator

    C.vdc-admin,vdc-operator,network-admin,andnetwork-operator

    D.vdc-admin,vdc-operator,network-admin,andnetwork-operator(forNexus7000)andnetwork-adminandnetwork-operator(forotherNexusswitches)

    E.adminandread-only


    参考答案:D

  • 第5题:

    在某台Cisco路由器中定义一个名为test的DHCP地址池(192.168.3.0/26),并保留192.168.3.62/29的IP地址。下列正确的配置语句是(29)。

    A.Router(config)#ip dhcp pooltest Router(dhcp-config)#network 192.168.3.00.0.0.63 Router(dhcp-config)#ip dhcp excluded-address192.168.3.62

    B.Router(config)#ip dhcp poo1 test Router(dhcp-config)#network 192.168.3.0255.255.255.192 Router(dhcp-config)#ip dhcp excluded-address 192.168.3.62255.255.255.248

    C.Router(config)#ip dhcp poo1 test Router(dhcp-config)#network 192.168.3.0/26 Router(dhcp-config)#ip dhcp excluded-address 192.168.3.62/29

    D.Router(config)#ip dhcp excluded-address 192.168.3.56192.168.3.62 Router(config)#ip dhcp pool test Router(dhcp-config)#network 192.168.3.0/26


    正确答案:D
    解析:子网地址是DHCP服务器可以分配给DHCP客户的有效IP地址范围。在DHCP Pool配置模式下,使用命令“networknetwork-number>[mask|/prefix-length]”配置IP地址池的子网地址和子网掩码。其中,子网掩码参数允许以两种形式表达,一种形式常见的点分十进制数表达形式(如 255.255.255.192),另一种形式是给出掩码前缀的长度,即掩码位为“1”的个数,如“255.255.255.192”可以写成“/26”。本试题中,配置DHCP地址池192.168.3.0/26的语句如下:
      Router(dhcp-config)#network192.168.3.0255.255.255.192
      或Router(dhcp-contig)#network192.168.3.0/26
      可以在全局配置模式“Router(config)#”下,使用“ip dhcp excluded-address low-address[high-address]”命令将要保留的地址从IP地址池中排除,使之成为不能动态分配的地址。本试题中,需要排除的IP地址范围是192.168.3.62/29。其中,“/29”是子网掩码255.255.255.248的前缀的长度。由于IP地址192.168.3.62的二进制表示是“1100 0000 1010 1000 0000 0011 1110”,其中阴影部分是子网掩码覆盖的比特范围,因此192.168.3.62/29所表达的IP地址范围是192.168.3.56-192.168.3.63。再由于192.168.3.63是 192.168.3.0/26网段的直接广播地址,需要排除,因此保留IP地址范围192.168.3.62/29的配置语句如下:
      Router(config)#ip dhcp excluded-adclress 192.168.3.56 192.168.3.62
      本试题选项A的“ip dhcp excluded-address192.168.3.62”仅排除单个IP地址192.168.3.62。选项B和选项C保留IP地址配置命令所在的配置模式有误,且不允许出现选项B的“ip dhcp exclude_address192.168.3.62 255.255.255.248”和选项C的“ip dhcp excluded-address 192.168.3.62/29”等带有子网掩码的格式。

  • 第6题:

    In?project?net work?diagram,the?number?of?critical?path?is()。

    A.none
    B.only?one
    C.only?two
    D.one?or?more

    答案:D
    解析:
    本题翻译:在项目网络工作图中,关键路径的数目是()。
    A.没有B.只有一个C.只有两个D.一个或更多
    本题考查的是进度管理中的关键路径,正确选项为D一个或更多。
    在一个网络图中关键路径有一条或多条,关键路径是项目中时间最长的活动顺序,决定着可能的项目最短工期。