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Which statement correctly describes the disabling of IP TTL 

题目
单选题
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 LSR

B

TTL propagation cannot be disabled in an MPLS domain

C

TTL propagation is only disabled on the ingress edge LSR

D

The TTL field of the MPLS label header is set to 255

E

The TTL field of the IP packet is set to 0

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相似问题和答案

第1题：

Which of the following correctly describes the English phoneme/d/?_________

A．A voiced dental fricative.
B．A voiced alveolar fricative.
C．A voiceless dental plosive.
D．A voiceless alveolar fricative.

答案：B
解析：
考查音素的分类。voiced“浊音”，dentM“齿音”，alveolar“齿龈音”，frieative"摩擦音”，plosive“爆破音”。／d／属于浊音、齿龈音和塞音。

第2题：

Which of the following correctly describes the English phoneme/θ/


A.A voiceless dental fricative.

B.A voiceless alveolar fricative.

C.A voiceless dental plosive.

D.A voiceless alveolar plosive.

答案：A
解析：
考查音素的分类。voiceless“不带声(清音的)”，dental“齿音”，alveolar“齿龈音”，fi'icative“摩擦音”，plosive“爆破音”，／θ／属于清音、齿音、摩擦音，故选A。

第3题：

Refer to the exhibit. A partial routing configuration is shown. Complete the configuration so that only the default - network is redistributed from EIGRP 190 into EIGRP 212. Which ACL statement completes the configuration correctly? （）

A. access - list 100 permit ip 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0 .0

B. access - list 100 permit ip host 0.0.0.0 any

C. access - list 100 permit ip any host 0.0.0.0

D. A default -network cannot be redistributed between routing processes.


参考答案：C

第4题：

Which statement correctly describes the Cisco implementation of RSTP？ （）

  • A、PortFast， UplinkFast， and BackboneFast specific configurations are ignored in Rapid PVST mode.
  • B、RSTP is enabled globally and uses existing STP configuration.
  • C、Root and alternative ports transition immediately to the forwarding state.
  • D、Convergence is improved by using sub-second timers for the blocking， listening， learning， and forwarding port states.

正确答案:B

第5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

正确答案:C

第6题：

Which of the following correctly describes the English phoneme/v/?

A．A voiceless labiodental fricative
B．A voiced labiodental fricative
C．A voiceless labiodental plosive
D．A voiced labiodental plosive

答案：B
解析：
考查语音的分类。voiceless“清音”；labiodental“唇齿音”；fricative“摩擦音”；plosive“爆破音”／v/属于浊音、唇齿音和摩擦音。故选B。

第7题：

Which of the following statements correctly describes the characteristics of a Frame Relay point-to-point subinterface?（）

  • A、Needs to use Inverse ARP.
  • B、Maps a single IP subnet per DLCI.
  • C、Maps a single IP subnet across multiple DLCIs.
  • D、Resolves NBMA (non broadcast multi access) split horizon issues.
  • E、Requires use of the frame-relay map command.
  • F、None of the above

正确答案:B,D

第8题：

Which statement describes the process of dynamically assigning IP addresses by the DHCP server?()

A. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.

B. Addresses are permanently assigned so that the hosts uses the same address at all times.

C. Addresses are assigned for a fixed period of time, at the end of the period, a new request for an address must be made.

D. Addresses are leased to hosts, which periodically contact the DHCP server to renew the lease.


参考答案：D

第9题：

Which statement correctly describes network security settings in Cisco Network Assistant for the Catalyst Express 500 Switch？（）

  • A、The LOW setting enables broadcast storm control， but has no effect on the number of devices that can connect to a switch port
  • B、The LOW setting enables broadcast storm control and limits the number of devices that can connect to a switch port.
  • C、The LOW setting disables broadcast storm control but limits the number of devices that can connect to a switch port
  • D、The default network setting is "HIGH"

正确答案:B

第10题：

Which statement correctly describes IPsec VPN backup technology？（）

  • A、The cypto isakmp keepalive command is used to configure the Stateful Switchover （SSO）protocol
  • B、Reverse Route Injection （RRI） is configured on at the remote site to inject the central sitenetworks
  • C、Each Hot Standby Routing Protocol （HSRP） standby group has two well-known MACaddresses and a virtual IP address
  • D、The cypto isakmp keepalive command is used to configure stateless failover

正确答案:D

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