When a BGP router&#8...

单项选择题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.单项选择题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

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2.单项选择题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

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3.单项选择题For the following ports， which port is on every bridge in a Spanning Tree Protocol IEEE 802.1w network except the root bridge？（）

A.root port
B.backup port
C.designated port
D.alternate port

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4.单项选择题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.

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5.单项选择题When two bridges are competing for the root bridge of an IEEE 802.1D spanning tree and both have the same bridge priority configured， which parameter determines the winner？（）

A.highest-numbered IP interface
B.MAC address
C.device uptime
D.root port cost

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6.单项选择题For the following items，what is the mathematical relationship between the committed information rate （CIR）， committed burst （Bc）， and committed rate measurement interval （Tc）？（）

A.CIR=TC/Bc
B.CIR=Be/Tc
C.Tc=CIR/Bc
D.Tc=Bc/CIR

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7.单项选择题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）

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8.单项选择题Policy-based routing allows network administrators to implement routing policies to allow or deny paths based on all of these factors except which one？（）

A.End system
B.Protocol
C.Application
D.Throughput

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9.单项选择题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

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10.单项选择题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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