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

第1题：

Which of the following technologies can improve convergence time following a link failure in a serviceprovider network？（）

• A、MPLS TE FR
• B、MPLS VPN
• C、BFD
• D、RSVP
• E、VPLS
• F、SNMP

第2题：

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.

第3题：

Which of the following command line utilities can Karen, a technician, use to check for open ports?（）

• A、nbtstat
• B、ipconfig
• C、nslookup
• D、netstat

第4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？（）

• A、fast convergence SFP
• B、MTU discovery
• C、redundancy links
• D、keepalive
• E、carrier delay

第5题：

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 up
• C、The entire network reconverges and a unique root briddge for the 802.1D segment， and a root bridge for the 802.1W segment， is chosen
• D、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 network
• E、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.

第6题：

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 fast
• B、enable uplink fast
• C、disable portfast
• D、enable portfast

第7题：

Why does RSTP have a better convergence time than 802.1D？（）

• A、it is newer
• B、it has smaller timers
• C、it has less overhead
• D、it is not timer-based

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第13题：

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.

第14题：

Routing convergence time is which of the following？（）

• A、Time required for a VPN connection to occur
• B、Time required by protocols to update their forwarding tables after changes have occurred
• C、Time required for an IDS to detect suspicious software
• D、Time required by switch ports to update their link status and transition to the forwarding state

第15题：

Which configuration command causes a PPPoE subscriber to be connected to a captive portal?（）

• A、url
• B、motm
• C、acName
• D、sessions

第16题：

Which of the following are true of Ethernet technology?（）

• A、Hosts use a logical ring topology.
• B、Hosts use a logical bus topology
• C、Hosts must wait for an electronic signal to transfer data.
• D、Hosts are directly connected to a wiring concentrator called a MSAU.

第17题：

Which command will show the MAC addresses of stations connected to switch ports?（）

• A、show mac-address
• B、show arp
• C、show table
• D、show switchport

第18题：

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

第19题：

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 database
• B、 The next time you are connected to the target database and the recovery catalog database and issue the resync command
• C、 The next time you connect RMAN to just the recovery catalog
• D、 The next time you connect to the recovery catalog and the target database with RMAN
• E、 Connecting to the recovery catalog and issuing the resync all databases command

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