Which command enhances the 802.1D convergence time on ports that are connected to hosts?() A. spanning-tree backbonefastB. spanning-tree uplinkfastC. spanning-tree portfastD. spanning-tree cost512
Which command enhances the 802.1D convergence time on ports that are connected to hosts?()
A. spanning-tree backbonefast
B. spanning-tree uplinkfast
C. spanning-tree portfast
D. spanning-tree cost512
相关考题：
Which UNIX command creates a symbolic link named myfile in the current directory to the file/etc/hosts?A．In -s/etc/hosts myfileB．In -s myfile/etc/hostsC．link -s/etc/hosts myfileD．link -s myfile/etc/hosts
Which CLI command displays the currently connected PPPoA subscribers?() A. show usersB. show subscribersC. show aaa subscriberD. show connected subscriber
Which of the following are true of Ethernet technology?A．Hosts use a logical ring topology.B．Hosts use a logical bus topologyC．Hosts must wait for an electronic signal to transfer data.D．Hosts are directly connected to a wiring concentrator called a MSAU.E．None of the above
Which command will show the MAC addresses of stations connected to switch ports?() A. show mac-addressB. show arpC. show tableD. show switchport
Which of the following technologies can improve convergence time following a link failure in a serviceprovider network？（）A、MPLS TE FRB、MPLS VPNC、BFDD、RSVPE、VPLSF、SNMP
The DAI feature has been implemented in the Company switched LAN. Which three statements are true about the dynamic ARP inspection （DAI） feature？ （）A、 DAI can be performed on ingress ports only.B、 DAI can be performed on both ingress and egress ports.C、 DAI is supported on access ports， trunk ports， EtherChannel ports， and private VLAN ports. D、 DAI should be enabled on the root switch for particular VLANs only in order to secure the ARP caches of hosts in the domain.E、 DAI should be configured on all access switch ports as untrusted and on all switch ports connected to other switches as trusted.F、 DAI is supported on access and trunk ports only.
You have done a partial migration from 802.1D STP to 802.1w STP. Which of the following is true？（）A、802.1D and 802.1w interoperate only when the 802.1D STP domain supports rapid convergence.B、Ports leading to 802.1D devices will run in compatibility mode， while the rest of the ports will run in 802.1w mode.C、This is an invalid configuration and a partial migration cannot be done.D、The bridge timers will be set to match the 802.1D devices.E、A secondary root bridge will always be populated within the 802.1D domain.F、If the root bridge is selected within the 802.1D domain， the whole STP domain will run in 802.1D compatibility mode.G、In partially migrated 802.1w networks， it is recommended to keep the STP diameter below 4.
Routing convergence time is which of the following？（）A、Time required for a VPN connection to occurB、Time required by protocols to update their forwarding tables after changes have occurredC、Time required for an IDS to detect suspicious softwareD、Time required by switch ports to update their link status and transition to the forwarding state
Which of the following command line utilities can Karen, a technician, use to check for open ports?（）A、nbtstatB、ipconfigC、nslookupD、netstat
Which configuration command causes a PPPoE subscriber to be connected to a captive portal?（）A、urlB、motmC、acNameD、sessions
You are about to design a very fast convergence time on a service provider network. Which feature wouldyou utilize to declare a link failure within less than two seconds of the fault on a link？（）A、fast convergence SFPB、MTU discoveryC、redundancy linksD、keepaliveE、carrier delay
Which of the following are true of Ethernet technology?（）A、Hosts use a logical ring topology.B、Hosts use a logical bus topologyC、Hosts must wait for an electronic signal to transfer data.D、Hosts are directly connected to a wiring concentrator called a MSAU.
Which two are effects of connecting a network segment that is running 802.1D to a network segment that is running 802.1w？（）A、the entire network switches to 802.1D and generates BPDUs to determine root bridfe status.B、A migration delay of three seconds occurs when the port that is connected to the 802.1D bridge comes upC、The entire network reconverges and a unique root briddge for the 802.1D segment， and a root bridge for the 802.1W segment， is chosenD、the first hop 802.1w switch that is connected to the 802.1D runs entirely in 802.1DCompatibility mode and converts the BPDUs to either 802.1D or 802.1W segments of the networkE、Classic 802.1D timers， Such as forward Delay and Max-age， will only be used as a backup， and will not be necessary if point-to-point links and edge prots are properly identified and set by the administrator.
Which command will show the MAC addresses of stations connected to switch ports?（）A、show mac-addressB、show arpC、show tableD、show switchport
In a high-availability network, which command, when placed on ports that have connected end stations, will allow you to prevent delays in service for end stations by placing a port in blocking mode?（）A、enable backbone fastB、enable uplink fastC、disable portfastD、enable portfast
Which command enhances the 802.1D convergence time on ports that are connected to hosts?（）A、spanning-tree backbonefastB、spanning-tree uplinkfastC、spanning-tree portfastD、spanning-tree cost512
Why does RSTP have a better convergence time than 802.1D？（）A、it is newerB、it has smaller timersC、it has less overheadD、it is not timer-based
If you back up a database without connecting to the recovery catalog， which operations will cause the recovery catalog to be updated？（）A、 The next time you back up the database when you are also connected to the recovery catalog and the target databaseB、 The next time you are connected to the target database and the recovery catalog database and issue the resync commandC、 The next time you connect RMAN to just the recovery catalogD、 The next time you connect to the recovery catalog and the target database with RMANE、 Connecting to the recovery catalog and issuing the resync all databases command
单选题Which of the following technologies can improve convergence time following a link failure in a serviceprovider network？（）AMPLS TE FRBMPLS VPNCBFDDRSVPEVPLSFSNMP
单选题You are about to design a very fast convergence time on a service provider network. Which feature wouldyou utilize to declare a link failure within less than two seconds of the fault on a link？（）Afast convergence SFPBMTU discoveryCredundancy linksDkeepaliveEcarrier delay
单选题Why does RSTP have a better convergence time than 802.1D？（）Ait is newerBit has smaller timersCit has less overheadDit is not timer-based
多选题If you back up a database without connecting to the recovery catalog， which operations will cause the recovery catalog to be updated？（）AThe next time you back up the database when you are also connected to the recovery catalog and the target databaseBThe next time you are connected to the target database and the recovery catalog database and issue the resync commandCThe next time you connect RMAN to just the recovery catalogDThe next time you connect to the recovery catalog and the target database with RMANEConnecting to the recovery catalog and issuing the resync all databases command
多选题The DAI feature has been implemented in the Company switched LAN. Which three statements are true about the dynamic ARP inspection （DAI） feature？ （）ADAI can be performed on ingress ports only.BDAI can be performed on both ingress and egress ports.CDAI is supported on access ports， trunk ports， EtherChannel ports， and private VLAN ports.DDAI should be enabled on the root switch for particular VLANs only in order to secure the ARP caches of hosts in the domain.EDAI should be configured on all access switch ports as untrusted and on all switch ports connected to other switches as trusted.FDAI is supported on access and trunk ports only.
单选题You have done a partial migration from 802.1D STP to 802.1w STP. Which of the following is true？（）A802.1D and 802.1w interoperate only when the 802.1D STP domain supports rapid convergence.BPorts leading to 802.1D devices will run in compatibility mode， while the rest of the ports will run in 802.1w mode.CThis is an invalid configuration and a partial migration cannot be done.DThe bridge timers will be set to match the 802.1D devices.EA secondary root bridge will always be populated within the 802.1D domain.FIf the root bridge is selected within the 802.1D domain， the whole STP domain will run in 802.1D compatibility mode.GIn partially migrated 802.1w networks， it is recommended to keep the STP diameter below 4.
单选题Routing convergence time is which of the following？（）ATime required for a VPN connection to occurBTime required by protocols to update their forwarding tables after changes have occurredCTime required for an IDS to detect suspicious softwareDTime required by switch ports to update their link status and transition to the forwarding state
单选题Which CLI command displays the currently connected PPPoA subscribers?（）Ashow usersBshow subscriberCshow aaa subscriberDshow connected subscriber
多选题The core of a network has four routers connected in a square design with Gigabit Ethernet links using /30 subnets. The network is used to carry voice traffic and other applications. Convergence time is taking more than expected. Which three actions would you take to improve OSPF convergence time？（）AIncrease MTU of the interfaces to accommodate larger OSPF packets.BChange the network type to point-to-point on those links.CReduce SPF initial timer.DIncrease hello interval to avoid adjacency flapping.EEnable OSPF