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ISRO | ISRO CS 2007 | Question 75

  • Last Updated : 22 Jun, 2018

When a host on network A sends a message to a host on network B, which address does the router look at?
(A) Port
(B) IP
(C) Physical
(D) Subnet mask

Answer: (B)

Explanation: Routing is done on the basis of IP addresses. A host on network A when sends the packet to the host on network B, it checks the IP address of the receiving host and routes the packet to the suitable hop.
Physical address i.e. the MAC address is used to recognize a unique host over a network on in a LAN.
Port number is required to identify a specific process or application to which a message is to be forwarded when it arrives at a server.

So, option (B) is correct.

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