MPLS中,可能执行SWAP操作的节点有()
第1题:
A. It performs a label pop operation and an IP lookup.
B. It performs a label swap operation and an IP lookup.
C. It sends an error message toward the egress router.
D. It sends an error message toward the ingress router.
第2题:
A.解析进入MPLS域的IP数据包的报头,划分FEC
B.查找标签转发信息表,通过标签交换完成MPLS报文的转发
C.将下游分配好的标签压入相对应的FEC,封装成MPLS报文
D.弹出标签,恢复成原来的报文进行转发
第3题:
第4题:
A.Ingress
B.Transit
C.Penultimate
D.Egress
第5题:
A.Ingress
B.Transit
C.Penultimate
D.Egress
第6题:
A. egress router
B. ingress router
C. start of the bypass tunnel
D. all routers in the bypass tunnel
第7题:
A.Ingress
B.Transit
C.Penultimate
D.Egress
第8题:
A. establish starting at the egress router going back to the ingress router
B. establish starting at the ingress router going downstream to the egress router
C. establish when a router learns of a new prefix
D. establish when the path correctly matches the reverse path forwarding check
第9题:
A.Ingress
B.Transit
C.Penultimate
D.Egress
第10题:
A.给IP报文封装MPLS标签时,直接将IP报文的TOS字段转换成MPLS标签的EXP字段
B.标签交换(swap)操作时,EXP字段保持不变
C.标签压栈(push)操作时,新压入的外层标签EXP字段继承内层标签的EXP字段
D.标签弹栈(pop)操作时,如果弹栈之后是MPLS报文,不会将弹出标签的EXP字段复制到内层标签上;如果弹栈之后为IP报文,不会将EXP字段复制到IP报文的TOS字段