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DNS servers provide what service? Given an IP address, they determine the name of the host that is sought． They convert domain names into IP addresses． They run a spell check on host names to ensure accurate routing． They map individual hosts to their specific IP addresses．

A Cisco router that was providing Frame Relay connectivity at a remote site was replaced with a different vendor’s frame relay router． Connectivity is now down between the central and remote site． What is the most likely cause of the problem? mismatched LMI types incorrect DLCI mismatched encapsulation types incorrect IP address mapping

Refer to the exhibit． What can be determined about routes that are learned from the router at IP address 190．171．23．12? [*] HQ_Router last received an update from 190．171．23．12 at 3:30 am． If HQ_Router does not receive an update from 190．171．23．12 in 30 seconds, all routes from that source will be removed from the routing table． If HQ_Router does not receive an update from 190．171．23．12 in 30 seconds, all routes from that source will be flagged with a hold-down timer． 190．171．23．12 is expected to send an update to HQ_Router for network 190．172．0．0 in 3 minutes and 30 seconds．

Refer to the exhibit． Why are two OSPF designated routers identified on Core_Router? [*] Core_Router is connected to more than one multiaccess network． The router at 208．149．23．130 is a secondary DR in case the primary fails． Two router IDs have the same OSPF priority and are therefore tied for DR election． The DR election is still underway and there are two contenders for the role．

A router learns about a remote network from EIGRP, OSPF, and a static route． Assuming all routing protocols are using their default administrative distance, which route will the router use to forward data to the remote network? The router will use the static route． The router will use the OSPF route． The router will use the EIGRP route． The router will load balance and use all three routes．

Refer to the exhibit． A new subnet with 12 hosts has been added to the network． Which subnet address should this network use to provide enough useable addresses while wasting the fewest addresses? [*] 192．168．10．80/28 192．168．10．80/29 192．168．10．96/28 192．168．10．96/29

What is one reason that WPA encryption is preferred over WEP? A WPA key is longer and requires more special characters than the WEP key． The access point and the client are manually configured with different WPA key values． WPA key values remain the same until the client configuration is changed． The values of WPA keys can change dynamically while the system is used．

An access list has been designed to prevent HTTP traffic from the Accounting Department from reaching the HR server attached to the Holyoke router． Which of the following access lists will accomplish this task when grouped with the e0 interface on the Chicopee router? [*] permit ip any any deny tcp 172．16．16．0 0．0．0．255 172．17．17．252 0．0．0．0 eq 80 permit ip any any deny tcp 172．17．17．252 0．0．0．0 172．16．16．0 0．0．0．255 eq 80 deny tcp 172．17．17．252 0．0．0．0 172．16．16．0 0．0．0．255 eq 80 permit ip any any deny tcp 172．16．16．0 0．0．0．255 172．17．17．252 0．0．0．0 eq 80 permit ip any any

When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined? It is supplied by the CSU/DSU． It is supplied by the far end router． It is determined by the clock rate command． It is supplied by the Layer 1 bit stream timing．

When a new trunk link is configured on an IOS based switch, which VLANs are allowed over the link? By default, all defined VLANs are allowed on the trunk． Each single VLAN, or VLAN range, must be specified with the switchport mode command． Each single VLAN, or VLAN range, must be specified with the vtp domain command． Each single VLAN, or VLAN range, must be specified with the vlan database command．

Refer to the exhibit． The network administrator has discovered that the VLAN configuration of SwitchC is ot synchronized with the rest of the switched network． Why is SwitchC not receiving VTP updates? [*] SwitchB is not relaying VTP advertisements to Switch C． SwitchC has fewer existing VLANs than does Switch A． SwitchA supports a greater number of VLANs than does Switch C． SwitchC has a revision number higher than that being advertised． SwitchC should be operating in VTP server mode to receive VTP updates．

What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table? The switch will not forward unicast frames． The switch will forward the frame to a specific port． The switch will return a copy of the frame out the source port． The switch will remove the destination MAC from the switch table． The switch will forward the frame to all ports except the port on which it was received．

A network administrator would like to implement NAT in the network shown in the graphic to allow inside hosts to use a private addressing scheme． Where should NAT be configured? [*] Corporate router Engineering router Sales router all routers all routers and switches

If an ethernet port on a router was assigned an IP address of 172．16．112．1/20, what is the maximum number of hosts allowed on this subnet? 1024 2046 4094 4096 8190

Refer to the exhibit． A network associate needs to configure the switches and router in the graphic so that the hosts in VLAN3 and VLAN4 can communicate with the enterprise server in VLAN2． Which two Ethernet segments would need to be configured as trunk links? [*] A B C D E

Refer to the exhibit． The network administrator must complete the connection between the RTA of the XYZ Company and the service provider． To accomplish this task, which two devices could be installed at the customer site to provide a connection through the local loop to the central office of the provider? [*] WAN switch PVC ATM switch multiplexer CSU/DSU

Acknowledgements, sequencing, and flow control are characteristics of which OSI layer? Layer 2 Layer 3 Layer 4 Layer 5 Layer 6

Which protocol provides a method of sharing VLAN configuration information between switches? VTP STP ISL 802．1Q VLSM

Which tables of EIGRP route information are held in RAM and maintained through the use of hello and update packets? neighbor table SPF table RTP table topology table query table

Which of the following are types of flow control? buffering cut-through windowing congestion avoidance load balancing

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