Category: CCNP

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QUESTION 21
You want to enhance the security within the Company LAN and prevent VLAN hopping. What two steps can be taken to help prevent this? (Select two)
A. Enable BPD guard
B. Disable CDP on ports where it is not necessary
C. Place unused ports in a common unrouted VLAN
D. Prevent automatic trunk configuration
E. Implement port security

Correct Answer: CD Explanation
Explanation/Reference:
Explanation:
To prevent VLAN hoping you should disable unused ports and put them in an unused VLAN, or a separate unrouted VLAN. By not granting connectivity or by placing a device into a VLAN not in use, unauthorized access can be thwarted through fundamental physical and logical barriers. Another method used to prevent VLAN hopping is to prevent automatic trunk configuration. Hackers used 802.1Q and ISL tagging attacks, which are malicious schemes that allow a user on a VLAN to get unauthorized access to another VLAN. For example, if a switch port were configured as DTP auto and were to receive a fake DTP packet, it might become a trunk port and it might start accepting traffic destined for any VLAN. Therefore, a malicious user could start communicating with other VLANs through that compromised port. References:
QUESTION 22
The Company network is being flooded with invalid Layer 2 addresses, causing switch CAM tables to be filled and forcing unicast traffic to be transmitted out all switch ports. Which type of Layer 2 attack is being used here?

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QUESTION 1
The following commands are issued on a Cisco Router:
Router(configuration)#access-list 199 permit tcp host 10.1.1.1 host 172.16.1.1 Router(configuration)#access-list 199 permit tcp host 172.16.1.1 host 10.1.1.1 Router(configuration)#exit Router#debug ip packet 199
What will the debug output on the console show?
A. All IP packets passing through the router
B. Only IP packets with the source address of 10.1.1.1
C. All IP packets from 10.1.1.1 to 172.16.1.1
D. All IP Packets between 10.1.1.1 and 172.16.1.1
Correct Answer: D Explanation
Explanation/Reference:
Explanation:
In this example, the “debug ip packet” command is tied to access list 199, specifying which IP packets should be debugged. Access list 199 contains two lines, one going from the host with IP address 10.1.1.1 to 172.16.1.1 and the other specifying all TCP packets from host 172.16.1.1 to
10.1.1.1.

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Cisco 642-813 Test Prep, Recenty Updated Cisco 642-813 Study Guide Is What You Need To Take

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QUESTION 1

Observe the topology in the exhibit. HSRP is configured between RTB and RTC with RTC as the active router. SW2 is configured as the root bridge for the Spanning Tree Protocol. What will happen if the serial connection of RTC is down?
A. STP will not need to be recalculated because RTB will take over as active router
B. RTB and RTC will flap between active and standby because the timers for the STP are greater that the timers for HSRP
C. All traffic will automatically forward to RTB
D. SW3 will take over as the new root bridge
Correct Answer: B QUESTION 2
Refer to the exhibit. What statement is true based upon the configuration of router R1 and router R2?

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Cisco 642-821 Cert Exam, Real Cisco 642-821 Vce & PDF 100% Pass With A High Score

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QUESTION 75
ADSL broadband connections using the PPPoE access method typically use which type of user authentication method?
A. AAA authentication
B. DNIS authentication
C. Caller-ID authentication
D. PPP CHAP authentication
E. IPSec authentication
F. L2TP authentication

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 76
Which three statements are true about the Point-to-Point Protocol (PPP) frame format? (Choose three.)
A. Link Control Protocol (LCP) is a PPP component for establishing, configuring, and testing the data-link connection.

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