What characteristics make ADSL the likely choice among DSL technologies for Teleworker?（）

A . It sends data in clear text format. B . It is no longer supported on Cisco network devices. C . It is more secure than SSH D . It requires an enterprise license in order to be implemented. E . It requires that the destination device be configured to support Telnet connections.

A . classful routing protocol B . variable-length subnet masks C . broadcast addressing D . manual route summarization E . uses SPF algorithm to compute path

A .  The design supports multiple server subnets Cisco 642-874： Practice Exam B .  An end-user sees the IP address of the real server C .  SLB routes between the outside and inside subnets D .  The source or destination MAC address is rewritten， but the IP addresses left alone E .  SLB acts as a "bump in the wire" between servers and upstream firewall or Layer 3 device

A . VTP messages are sent out all switch-switch connections. B . VTP L2 messages are communicated to neighbors using CDP. C . VTP manages addition， deletion， and renaming of VLANs 1 to 4094. D . VTP pruning restricts flooded traffic， increasing available bandwidth. E . VTP V2 can only be used in a domain consisting of V2 capable switches. F . VTP V2 performs consistency checks on all sources of VLAN information.

A . displays a screen with Fix-it check boxes to let you choose which potential security-related configuration changes to implement B . has two modes of operationinteractive and non-interactive C . automatically enables Cisco IOS firewall and Cisco IOS IPS to secure the router D . uses interactive dialogs and prompts to implement role-based CLI E . requires users to first identify which router interfaces connect to the inside network and which connectto the outside network

A . The design supports multiple server subnets. B . An end-user sees the IP address of the real server. C . SLB routes between the outside and inside subnets. D . The source or destination MAC address is rewritten, but the IP addresses left alone. E . SLB acts as a "bump in the wire" between servers and upstream firewall or Layer 3 devices.

A . service guarantee B . traffic that is divided into classes C . not scalable to large implementations D . QoS mechanisms that are used without prior signaling E . applications that signal their particular QoS and bandwidth requirement

A . They are self-priming B . Decreasing the speed of rotation will decrease the discharge pressure C . Opening the discharge valve wider will increase the discharge pressure D . All of the above

A . The exchange of advertisement is triggered by a change in the network. B . All routers exchange routing tables with each other iIn a multipoint network. C . Packets are routed based upon the shortest path to the destination. D . Paths are chosen depending on the cost efficiency factor. E . Every router in an OSPF area is capable of representing the entire network topology. F . Only the designated router in an OSPF area can represent the entire network topology.

A .  It helps verify end-to-end path availability. B .  It provides traffic rerouting in case of disaster. C .  HSRP， GLBP， and VRRP can be clients of GSS. D .  BGP must be the routing protocol between the distributed data centers. E .  DNS responsiveness is improved by providing centralized domain management.

A . Latency fluctuates regardless of frame size. B . The switch receives the complete frame before beginning to forward it. C . Latency through the switch varies with frame length. D . The switch checks the destination address upon receipt of headers.

A . NTP updates are sent in the timezone they are collected in，and the syslog server will adjust based  on the input time. B . NTP authentication verifies the source，not the recipient. C . NTP authentication requires that the recipient has multiple strata clocks to ensure accuracy. D . Secure NTP can be configured to use SHA-1 hashing，since NTP is very insecure. E . A stratum 0 clock should be configured at the core of every network，so it can connect to an accuratetime source.

A . It can take on HSRP, VRRP, and GLBP as clients. B . It provides automatic inbound route optimization. C . Path selection may be based on delay, loss, or jitter. D . The border router makes decisions about which outbound path to use. E . Automatic load distribution is provided for multiple connections.

A . It converges quickly. B . OSPF is a classful routing protocol. C . It uses cost to determine the best route. D . It uses the DUAL algorithm to determine the best route. E . OSPF routers send the complete routing table to all directly attached routers. F . OSPF routers discover neighbors before exchanging routing information.

A . It helps verify end-to-end path availability. B . It provides traffic rerouting in case of disaster. C . HSRP, GLBP, and VRRP can be clients of GSS. D . BGP must be the routing protocol between the distributed data centers. E . DNS responsiveness is improved by providing centralized domain management.

A .  It can take on HSRP， VRRP， and GLBP as clients. B .  It provides automatic inbound route optimization. C .  Path selection may be based on delay， loss， or jitter. D .  The border router makes decisions about which outbound path to use. E .  Automatic load distribution is provided for multiple connections.

A . Itsendsdataincleartextformat. B . ItisnolongersupportedonCisconetworkdevices. C . ItismoresecurethanSSH D . Itrequiresanenterpriselicenseinordertobeimplemented. E . ItrequiresthatthedestinationdevicebeconfiguredtosupportTelnetconnections.

A . VLANs logically divide a switch into multiple, independent switches at Layer 2. B . Trunk links can carry traffic for multiple VLANs. C . VLAN implementation significantly increases traffic due to added trunking information. D . A VLAN can span multiple switches. E . VLANs extend the collision domain to include multiple switches. F . VLANs typically decrease the number of multiple switches.

A . It is needed to identify a unique instance of an OSPF database. B . It is an optional parameter only necessary if multiple OSPF processes are used. C . It is locally significant. D . It is globally insignificant E . All routers in the same OSPF area must have the same process ID to exchange routing information.

A . classful routing protocol B . variable-length subnet masks C . broadcast addressing D . manual route summarization E . uses SPF algorithm to compute path

A．Twitter"s ads are actually hidden among ordinary tweets. B．Twitter prefers to use big glossy images to attract people"s attention. C．Twitter"s ads are usually sponsored by big companies like Starbucks D．After three years" trial, Twitter has decided to change its ads style.