单选题In MPLS networks, what s the benefit of disabling TTL propagation?（）ATo provide a visible extension of MPLS TTL functionality in a non MPLS-enabled domainBTo improve the IGP convergence timeCTo hide visibility to the core (provider) routers in the MPLS networkDTo provide a visible extension of IP TTL functionality in an MPLS-enabled domain
单选题
In MPLS networks, what s the benefit of disabling TTL propagation?（）
A
To provide a visible extension of MPLS TTL functionality in a non MPLS-enabled domain
B
To improve the IGP convergence time
C
To hide visibility to the core (provider) routers in the MPLS network
D
To provide a visible extension of IP TTL functionality in an MPLS-enabled domain
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Refer to the exhibit, Host A pings interface S0／0 on router 3, what is the TTL value for that ping?() A. 253B. 252C. 255D. 254
MPLS标签头部封装中的TTL字段可以防止报文的无限循环转发,哪些TTL的描述是正确的()。 A.只有在帧模式的MPLS封装中才有TTL，在信元模式的MPLS封装中没有TTLB.MPLS对于TTL的处理有两种方式。一种是IP报文在进入MPLS网络的时候MPLS头部的TTL拷贝IPTTL值；另外一种是在入口LER将MPLS头部的TTL统一设置为255C.拷贝IPTTL值的处理方式隐藏了MPLS域的LSR，起到了一定的安全的作用D.禁止了拷贝TTL的情况下，tracert能看到经过的MPLS域的LSR
MPLS也有环路检测的方法,对MPLS的环路检测的说法正确的是()。 A.MPLS可以使用IP头部的TTL域来防止报文的无限循环转发B.在帧模式的MPLS封装中才有TTL，在信元模式的MPLS封装中没有TTLC.可以通过LDP路径向量法和最大跳数法D.单播IP报文的MPLS转发是使用IGP产生的无环路的路径
通常,MPLS包头中有()Bit用作标签(Label);3个Bit的EXP,协议中没有明确,通常用作COS;1个Bit的S,用于标识是否是栈底,表明MPLS的标签可以嵌套;8个Bit的TTL。 A.16B.19C.20D.24
In MPLS networks, what s the benefit of disabling TTL propagation?（）A、To provide a visible extension of MPLS TTL functionality in a non MPLS-enabled domainB、To improve the IGP convergence timeC、To hide visibility to the core (provider) routers in the MPLS networkD、To provide a visible extension of IP TTL functionality in an MPLS-enabled domain
As a network administrator, you are required to deploy MPLS technology. During the deployment, it is recommended to apply conditional label advertising. What is most probably the reason for that?（）A、to enable label switching on the frame mode interfaceB、to restrict MPLS availability to predefined time periodsC、to restrict end users from seeing the routers in the MPLS networkD、to restrict label switching to a limited number of networks
MPLS对TTL的处理有两种方法，其中一种是把MPLS TTL计入IP TTL，如果一个TTL为10的IP报文通过三台路由器所组成的MPLS域时，它的TTL会减为（）。A、7B、8C、9D、10
Which statement correctly describes the disabling of IP TTL propagation in an MPLS network？（）A、The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSRB、TTL propagation cannot be disabled in an MPLS domainC、TTL propagation is only disabled on the ingress edge LSRD、The TTL field of the MPLS label header is set to 255E、The TTL field of the IP packet is set to 0
What IOS commands display MPLS label mapping on an LSR？（）A、Show mpls forwading-tableB、Show mpls ldp bindingsC、Show mpls ldp neighbor detailD、Show mpls ldp parametersE、Show mpls ldp discovery
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单选题Which statement correctly describes the disabling of IP TTL propagation in an MPLS network？（）AThe TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSRBTTL propagation cannot be disabled in an MPLS domainCTTL propagation is only disabled on the ingress edge LSRDThe TTL field of the MPLS label header is set to 255EThe TTL field of the IP packet is set to 0
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