單項選擇題Which statement about vlan operation on cisco catalyst switches is true?（）

A.when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table
B.unkown unicast frames are retransmitted only to the ports that belong to the same vlan
C.ports between switches should be configured in access mode so that vlans can span across the ports
D.broadcast and multicast frames are retransmitted to ports that are configured on different vlan.


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1.單項選擇題What is an appropriate use of a default route？（）

A.to provide routing to a local web server
B.to provide routing from an ISP to a stub network
C.to provide routing that will override the configured dynamic routing protocol
D.to provide routing to a destination that is not specified in the routing table and which is outside the local network

2.多項選擇題Which two statements describe the advantages to the use of RIP over the use of OSPF?（）

A.RIP requires less time to converge
B.RIP uses less bandwidth
C.RIP is less complex to configure
D.RIP demands fewer router resources
E.RIP has a more accurate metric

3.單項選擇題What is valid reason for a switch to deny port access to new devices when port security is enabled？ （）

A.The denied MAC addresses have already been learned or confgured on another secure interface in the same VLAN.
B.The denied MAC address are statically configured on the port.
C.The minimum MAC threshold has been reached.
D.The absolute aging times for the denied MAC addresses have expired.

4.單項選擇題A router receives information about network 192.168.10.0/24 from multiple sources.What will the router consider the most reliable information about the path to that network?（）

A.an OSPF update for network 192.168.0.0/16
B.a static router to network 192.168.10.0/24
C.a static router to network 192.168.10.0/24 with a local serial interface configured as the next hop
D.a RIP update for network 192.168.10.0/24
E.a directly connected interface with an address of 192.168.10.254/24
F.a default route with a next hop address of 192.168.10.1

6.多項選擇題Which two statements are true regarding EIGRP？（）

A.Passive routes are in the process of being calculated by DUAL.
B.EIGRP supports VLSM，route summarization，and routing update authentication.
C.EIGRP exchanges full routing table information with neighboring routers with every update.
D.If the feasible successor has a higher advertised distance than the successor route，it becomes theprimary route.
E.A query process is used to discover a replacement for a failed route if a feasible successor is not identified from the current routing information.

9.單項選擇題Which command can be used to verify the DLCI destination address in a Frame Relay static configuration?（）

A.show frame-relay end-to-end
B.show frame-relay map
C.show frame-relay lmi
D.show frame-relay pvc

10.多項選擇題As a frame leaves a Layer 3 device，the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen？（）

A.The data is moving from 10BASE-TX to 100BASE-TX.
B.The WAN encapsulation type has changed.
C.The data format has changed from analog to digital.
D.The source and destination hosts are in the same subnet.
E.The source and destination MAC addresses have changed.