默认题库 - CCNP(642-813)

单选题

A campus infrastructure supports wireless clients via Cisco Aironet AG Series 1230， 1240， and 1250 access points. With DNS and DHCP configured， the 1230 and 1240 access points appear to boot and operate normally； however， the 1250 access points do not seem to operate correctly. What is the most likely issue causing this problem？（）

A. PoE
B. DHCP with option 150
C. DHCP with option 43
DNS
E. switch port does not support gigabit speed

单选题

The network administrator has enabled BPDU guard on the LAN. Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？（）

A. BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network.
BPDU guard can guarantee proper selection of the root bridge.
C. BPDU guard can be utilized to prevent the switch from transmitteing BPDUs and incorrectly altering the root bridge election.
D. BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port.
E. None of the other alternatives apply

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多选题

What are two methods of mitigating MAC address flooding attacks？（）

A. Place unused ports in a common VLA
B. Implement private VLANs.
C. Implement DHCP snooping.
D. Implement port security.
E. Implement VLAN access maps.

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单选题

Which of the following conditions guarantees that a broadcast storm cannot occur？（）

A. a native VLAN mismatch on either side of an 802.1Q link
BPDU filter configured on a link to another switch
C. Spanning Tree Protocol enabled on both Layer 2 and multilayer switches
D. PortFast enabled on all access and trunk port

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单选题

Which of the following will generate an RSTP topology change notification？（）

A. an edge port that transitions to the forwarding state
B. a non-edge port that transitions to the blocking state
C. a non-edge port that transitions to the forwarding state
D. an edge port that transitions to the blocking state
E. any port that transitions to the blocking state
F. any port that transitions to the forwarding state

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单选题

Which statement is correct about the use of the virtual interface on a WLC ？（）

A. Used to relay DHCP messages
B. Used to communicate with LAPs
C. Used to bring up LWAPP tunnels
D. Used to extend into the wireless client VLAN

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单选题

Which statement about the Lightweight Access Point Protocol （LWAPP） is true？（）

A. LWAPP encrypts both control traffic and user data.
B. LWAPP encrypts user traffic with an x.509 certificate using AES-CCM
C. When set to Layer 3， LWAPP uses a proprietary protocol to communicate with the Cisco Aironet APs.
D. LWAPP encrypts control traffic between the AP and the controller.
E. None of the other alternatives apply.

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单选题

Under what circumstances should an administrator prefer local VLANs over end-to-end VLANs？（）

A. Eighty percent of traffic on the network is destined for Internet sites.
B. There are common sets of traffic filtering requirements for workgroups located in multiple buildings.
C. Eighty percent of a workgroup’s traffic is to the workgroup’s own local server.
D. Users are grouped into VLANs independent of physical location.
E. None of the other alternatives apply

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单选题

What network information do you need when you plan to implement a VLAN-based solution？（）

A. default VLAN information for all unused switch ports
B. 802.1x configuration parameters
C. number of IP subnets needed
D. IP routing protocol informatio

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单选题

What is needed to verify that a newly implemented security solution is performing as expected？（）

A. a detailed physical and logical topology
B. a cost analysis of the implemented solution
C. detailed logs from the AAA and SNMP servers
D. results from audit testing of the implemented solutio

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The network administrator has enabled BPDU guard on the LAN. Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？ （）

What are two methods of mitigating MAC address flooding attacks？（）

Which of the following conditions guarantees that a broadcast storm cannot occur？（）

Which of the following will generate an RSTP topology change notification？（）

Which statement is correct about the use of the virtual interface on a WLC ？（）

Which statement about the Lightweight Access Point Protocol （LWAPP） is true？ （）

Under what circumstances should an administrator prefer local VLANs over end-to-end VLANs？（）

What network information do you need when you plan to implement a VLAN-based solution？（）

What is needed to verify that a newly implemented security solution is performing as expected？ （）

The network administrator has enabled BPDU guard on the LAN. Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？（）

Which statement about the Lightweight Access Point Protocol （LWAPP） is true？（）

What is needed to verify that a newly implemented security solution is performing as expected？（）