單項選擇題When a BGP router is not capable of understanding 4-byte AS numbers， it will see 4-byte AS numbers as a special， reserved， 2-byte AS number in the AS path. Which 2-byte AS number is this reserved one？（）

A.00000
B.12345
C.23456
D.65000
E.99999


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1.單項選擇題What is the STP root guard feature designed to prevent？（）

A.a root port being transitioned to the blocking state
B.a port being assigned as a root port
C.a port being assigned as an alternate port
D.a root port being transitioned to the forwarding state

2.單項選擇題IEEE 802.1w is a Rapid Spanning Tree Protocol （RSTP） that can be seen as an evolution of the 802.1 standard. What are the port roles described by 802.1w？（）

A.root port，designated port，alternate port，backup port，and disabled
B.standby port，alternate port，root port，and disabled
C.standby port，designated port，backup port，and disabled
D.root port，designated port，alternate port，and standby port

4.單項選擇題What are the "bound IP addresses" used for in LDP？（）

A.For each such address and mask /32, one label binding is created.
B.As the TCP endpoint, IP addresses are used by the LDP session.
C.These addresses are used to find the label binding to put in the LFIB, by looking up these IP addresses in the routing table.
D.These addresses are used for penultimate hop popping (PHP) when forwarding packets to the next router directly. 

7.單項選擇題For the following protocols， which one provides a mechanism to transparently intercept and redirect CIFS traffic from a client to a local Cisco Wida Area Application engine？（）

A.Virtual Router Redundancy Protocol（VRRP）
B.File Transport Protocol（FTP）
C.Hot Standby Routing Protocol（HSRP）
D.Web Cache Communication Protocol（WCCP）

9.單項選擇題Phase I and Phase II DMVPN differ in terms of which of these characteristics？（）

A.Utilization of spoke-to-spoke dynamic tunnels
B.Utilization of multipoint GRE tunnels at the hub site
C.Utilization of hub-to-spoke dynamic tunnels
D.Support for multicast

10.單項選擇題Which one of the following potential issues is eliminated by using split horizon？（）

A.Joined horizons
B.Packet forwarding loops
C.cisco Express Forwarding load-balancing inconsistency
D.Asymmetric routing throughout the network

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