单项选择题

When BGP is used as the PE-CE routing protocol, which o……

When BGP is used as the PE-CE routing protocol, which of these statements is correct?（）

A. On the CE router, PE neighbors must be configured in the VRF context on the CE router
B. On PE routers, the CE IBGP neighbors are configured in the global BGP configuration
C. On PE routers, the CE EBGP neighbors are configured in the VRF context
D. A separate BGP process must be used on the PE routers for CE routers so that they do not use the same BGP routing process as that used for the PE router's other provider neighbors

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单项选择题When EIGRP is used as the PE-CE routing protocol which of these statements is correct?（）

A. EIGRP can be used only as the PE-CE routing protocol if the PE and CE routers are in the same AS
B. Other EIGRP AS routes are automatically advertised to the CE router and do not require a redistribution configuration command to be configured
C. Unlike other routing protocols that are used between PE and CE routers, EIGRP supports backdoor links
D. Configure of the VPN is only required on the PE router

单项选择题The router SIS-R has been configured in a CIS network. As a network administrator, you were required to enable MPLS on that router. Which of the following description is making sense on the basis of the output information?（）

A. CEF switching is only needed to forward labeled packets.
B. CEF switching is needed on both ingress and egress interfaces on which MPLS is enabled.
C. Interface-level CEF switching is needed only on egress interfaces that are sending IP packets on which the egress LSR performs the label imposition process.
D. Interface-level CEF switching is needed only on ingress interfaces that are receiving IP packets on which the ingress LSR performs the label imposition process.

单项选择题Which of these tools should you use to compress VoIP packets on a low-speed Frame Replay circuit?（）

A. Cisco Proprietary payload compression
B. Predictor payload compression
C. RTP header compression
D. TCP header compression

单项选择题Which version of NTP was the first to support cryptographic authentication?（）

A.Version 1
B.Version 5
C.Version 4
D.Version 3

单项选择题How does NTP help you troubleshoot network problems?（）

A. By calculating the time offset from the GPS or atomic clock
B. By setting the router clock to the default value if the router can't connect to a time server
C. By setting all network devices to the correct time
D. By setting necessary time date in the timestamp information