Refer to the exhibit.

What is the next hop address for traffic that is destined to host 10.0.1.5?

• A.10.0.1.3
• B.10.0.1.50
• C.10.0.1.4
• D.Loopback D

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Which two statements about eBGP neighbor relationships are true? (Choose two)

• A.The two devices must have matching timer settings
• B.The two devices must reside in different autonomous systems
• C.The two devices must reside in the same autonomous system
• D.Neighbors must be specifically declared in the configuration of each device
• E.They can be created dynamically after the network statement is configured.

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Drag and drop the WLAN components from the left onto the correct descriptions on the right.

Correct Answer:

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Which two statements about exterior routing protocols are true? (Choose two.)

• A.They determine the optimal within an autonomous system.
• B.They determine the optimal path between autonomous systems.
• C.BGP is the current standard exterior routing protocol.
• D.Most modern networking supports both EGP and BGP for external routing.
• E.Most modern network routers support both EGP and EIGRP for external routing.

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Drag and drop the threat-mitigation techniques from the left onto the types of threat or attack they mitigate on the right.

Correct Answer:

Explanation:

Double-Tagging attack:
In this attack, the attacking computer generates frames with two 802.1Q tags. The first tag matches the native VLAN of the trunk port (VLAN 10 in this case), and the second matches the VLAN of a host it wants to attack (VLAN 20).

When the packet from the attacker reaches Switch A, Switch A only sees the first VLAN 10 and it matches with its native VLAN 10 so this VLAN tag is removed. Switch A forwards the frame out all links with the same native VLAN 10. Switch B receives the frame with an tag of VLAN 20 so it removes this tag and forwards out to the Victim computer.
Note: This attack only works if the trunk (between two switches) has the same native VLAN as the attacker.
To mitigate this type of attack, you can use VLAN access control lists (VACLs, which applies to all traffic within a VLAN. We can use VACL to drop attacker traffic to specific victims/servers) or implement Private VLANs.
ARP attack (like ARP poisoning/spoofing) is a type of attack in which a malicious actor sends falsified ARP messages over a local area network as ARP allows a gratuitous reply from a host even if an ARP request was not received. This results in the linking of an attacker's MAC address with the IP address of a legitimate computer or server on the network. This is an attack based on ARP which is at Layer 2.
Dynamic ARP inspection (DAI) is a security feature that validates ARP packets in a network which can be used to mitigate this type of attack.

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