Networking scenario based interview questions and answers

The following is a scenario based networking interview question based on VPN technology.

This question is sample from the Ebook 250 Network and security admin interview questions and answers. Click here to view details on Amazon

The questions are based on the below network topology.

networking scenario

Question 1

What should be configured to avoid internet packets to be not sent through the VPN tunnel.

The routers at each site should be configured with a default route, which should send packets through the interface which is connected to the internet.

Question 2

Will the packets which are sent to the internet encrypted by the VPN routers

Encryption is applied only to packets which are sent over the VPN tunnel. Internet bound packets are not encrypted.

Question 3

What would be the destination IP address in the IP header when a packet is initiated from 192.168.1.2 to 192.168.2.3 when it reaches S1 (R2)

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Question 4

What would be the destination IP address in the IP header when a packet is initiated from 192.168.1.2 to 192.168.2.3 when it reaches 192.168.2.3

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Question 5

Should the public IP address which is configured on R1 (S0) and R2 (S1) be on the same network

This is not required. The VPN routers would be at different locations, where the public IP address provided by the respective ISP‟s would be on different networks.

Question 6

If a packet sniffer is used on the VPN tunnel can the inner IP header be viewed

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Question 7

Are the pre-shared keys used between the routers used for data encryption between systems at the different sites.

No. The keys are derived dynamically as part of IPSEC phase 1 and phase 2 tunnel creation.

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