多項(xiàng)選擇題Unicast Reverse Path Forwarding （Urpf ） can work in the following modes：（）

A.Express mode
B.Strict mode
C.Loose mode
D.Tunnel mode
E.Safe mode


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1.多項(xiàng)選擇題Select the three valid LMI extension.（）

A.Multicasting
B.Global addressing
C.Forward-explicit congestion notification （FECN）
D.Virtual circuit status messages.
E.Backward-explicit congestion notification （BECN）

2.多項(xiàng)選擇題When provisioning for Interactive-Video（e，g，video conferencing traffic）which three statementsdepicts the correct requirements？（）

A.Loss should be no more than 1 percent.
B.One-way latency should be no more than 150 ms
C.Jitter should be no more than 30 ms
D.Loss should be no more than 3 percent
E.One-way latency should be no more than 150/2=75 ms
F.Jitter should be no more than 300 ms

4.單項(xiàng)選擇題Which statement about the Link Control Protocol （LCP） is true？（）

A.LCP is used for basic PPP link setup and operation.
B.LCP is used for PPP CHAP authentication.
C.LCP is used for PPP over ATM （PPPoA） setup.
D.LCP is used for PPP over Ethernet （PPPoE） setup.
E.LCP is used for PPP over Frame Relay （PPPoFR） setup

5.多項(xiàng)選擇題In which two ways does the BGP graceful restart capability preserve prefix information during a restart？（）

A.The peer router sends an end-of RIB message to the restarting router
B.The peer router immediately removes the BGP routes that it learned from the restarting router from its BGP routing table
C.The restarting router does not remove any stale prefixes after the timer for stale entries expires
D.The router establishes BGP sessions with other routers and relearns the BGP routes from other routers that are also capable of graceful restart. The restarting router waits to receive updates from the neighboring routers. When the neighboring routers send end-of-RIB messages to indicate that they are done sending updates， the restarting router starts sending its own updates
E.The restarting router removes any stale prefixes after the timer for stale entries expires

6.多項(xiàng)選擇題Which three IS-IS TLVs are used to support MPLS traffic engineering？ （）

A.extended TLV 22
B.extended TLV 23
C.extended TLV 134
D.extended TLV 135
E.extended TLV 136
F.extended TLV 138

7.多項(xiàng)選擇題Which four of these are MPLS label header fields？ （）

A.Label
B.VPI VCI
C.EXP
D.TTL
E.FCS
F.S flag

8.多項(xiàng)選擇題All secure domain routers （SDRs） have shared attributes and resources. Which three resources areshared among all SDRs？ （）

A.SNMP traps
B.fabric cards
C.exec-level configuration
D.privilege-level configuration
E.admin-level configuration

9.單項(xiàng)選擇題In optical channel transport unit overhead （OTU OH）， what are general communication channels 1 and 2（GCC1/GCC2） used for？（）

A.for trail trace identification
B.as the backward defect indicator
C.to transmit information between OTU termination points
D.to extend command and management functions over several frames
E.General communication channels 1 and 2 （GCC1/GCC2） do not belong to OTU OH

10.多項(xiàng)選擇題Which three of these statements about PPPoE are true？（）

A.PPPoE can provide a host with access to a destination over Ethernet. You can have only one  PPPoE session per PVC
B.You must install PPPoE client software on all hosts that connect to the Ethernet segment. This means that the access provider must maintain a CPE
C.You cannot use PPPoE with Cisco Service Selection Gateway
D.PPPoE implementation is susceptible to broadcast storms and possible denial-of-service attacks
E.Per-session accounting is possible， which allows the service provider to charge the subscriber based on session time for various services offered. The service provider can also require a minimum access charge