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单选题
What Cisco Switch feature best protects against CAM table overflow attacks?()
A
Storm Control
B
Port security
C
CAM table size definition
D
IP spoof prevention
E
Network Based Application Recognition
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单选题You suspect that a hacker may be performing a MAC address flooding attack somewhere within the network. Which description correctly describes a MAC address flooding attack?()A
The attacking device spoofs a source MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.B
Frames with unique, invalid destination MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space, and traffic is subsequently flooded out all ports.C
The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the destination address found in the Layer 2 frames sent by the valid network device.D
The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the source address found in the Layer 2 frames sent by the valid network device.E
The attacking device spoofs a destination MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.F
Frames with unique, invalid source MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space, and traffic is subsequently flooded out all ports.G
None of the other alternatives apply
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单选题If a switch is working in the fail-open mode, what will happen when the switch’s CAM table fills to capacityand a new frame arrives?()A
A copy of the frame is forwarded out all switch ports other than the port the frame was received on.B
The frame is transmitted on the native VLAN.C
The switch sends a NACK segment to the frame’s source MAC address.D
The frame is dropped.
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单选题What is a new feature of the Cisco ISR router? ()A
advanced integration moduleB
FICON portsC
Cisco CallManager 5.0 supportD
warm Cisco IOS upgrade feature
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单选题While you are troubleshooting network performance issues, you notice that a switch is periodically flooding all unicast traffic. Further investigation reveals that periodically the switch is also having spikes in CPU utilization, causing the MAC address table to be flushed and relearned. What is the most likely cause of this issue?()A
a routing protocol that is flooding updatesB
a flapping port that is generating BPDUs with the TCN bit setC
STP is not running on the switchD
a user that is downloading the output of the show-tech commandE
a corrupted switch CAM table
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单选题What Cisco CE520 feature optimizes quality of service?()A
Cisco Configuration AssistantB
CiscoSmartportsC
Cisco Network Admission ControlD
Cisco Smart Assist
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MPLS Traffic EngineeringB
Dynamic access-listsC
AuthenticationD
Receive ACLE
Unicast RPF
考题
单选题What Cisco technology protects against Spanning-Tree Protocol manipulation?()A
Spanning tree protectB
Root Guard and BPDU GuardC
Unicast Reverse Path ForwardingD
MAC spoof guardE
Port Security
考题
多选题Which three statements best describe multicast operation on Cisco Nexus switches in a data center?()ACisco NX-OS Software does not support PIM dense mode.BThe command ip multicast-routing must be enabled in Cisco NX-OS Software before any multicast configuration is possible on the switch.CPIM CLI configuration and verification commands are not available until you enable the PIM feature with the feature pim command.DCisco NX-OS Software supports multicast routing per Layer 3 VRF instance.EThe default PIM operational mode on the Cisco Nexus 7000 switch is SSM.
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