642-813 Exam

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1. What does the command "udld reset" accomplish?
A. allows a UDLD port to automatically reset when it has been shut down
B. resets all UDLD enabled ports that have been shut down
C. removes all UDLD configurations from interfaces that were globally enabled
D. removes all UDLD configurations from interfaces that were enabled per-port
Answer: B

2. Which statement is true about Layer 2 security threats?
A. MAC spoofing, in conjunction with ARP snooping, is the most effective counter-measure against
reconnaissance attacks that use Dynamic ARP Inspection to determine vulnerable attack points.
B. DHCP snooping sends unauthorized replies to DHCP queries.
C. ARP spoofing can be used to redirect traffic to counter Dynamic ARP Inspection.
D. Dynamic ARP Inspection in conjunction with ARP spoofing can be used to counter DHCP snooping
attacks.
E. MAC spoofing attacks allow an attacking device to receive frames intended for a different network host.
F. Port scanners are the most effective defense against Dynamic ARP Inspection.
Answer: E

3. What does the global configuration command "ip arp inspection vlan 10-12,15" accomplish?
A. validates outgoing ARP requests for interfaces configured on VLAN 10, 11, 12, or 15
B. intercepts all ARP requests and responses on trusted ports
C. intercepts, logs, and discards ARP packets with invalid IP-to-MAC address bindings
D. discards ARP packets with invalid IP-to-MAC address bindings on trusted ports
Answer: C

4. What are two methods of mitigating MAC address flooding attacks? (Choose two.)
A. Place unused ports in a common VLAN.
B. Implement private VLANs.
C. Implement DHCP snooping.
D. Implement port security.
E. Implement VLAN access maps
Answer: DE

5. What is one method that can be used to prevent VLAN hopping?
A. Configure ACLs.
B. Enforce username and password combinations.
C. Configure all frames with two 802.1Q headers.
D. Explicitly turn off DTP on all unused ports.
E. Configure VACLs.
Answer: D

6. Why is BPDU guard an effective way to prevent an unauthorized rogue switch from altering the spanningtree
topology of a network?
A. BPDU guard can guarantee proper selection of the root bridge.
B. BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the
port.
C. BPDU guard can be utilized to prevent the switch from transmitting BPDUs and incorrectly altering the
root bridge election.
D. BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network.
Answer: B

7. What two steps can be taken to help prevent VLAN hopping? (Choose two.)
A. Place unused ports in a common unrouted VLAN.
B. Enable BPDU guard.
C. Implement port security.
D. Prevent automatic trunk configurations.
E. Disable Cisco Discovery Protocol on ports where it is not necessary.
Answer: AD