Question: A router is involved in ____________ layers of the TCP/IP protocol suite.

Answer:

• A router is a networking device that operates at the Network layer (Layer 3) of the TCP/IP protocol suite. Its primary function is to forward packets between networks by examining the destination IP address of each packet and determining the best path to the destination network.
• However, a router may also be involved in the Transport layer (Layer 4) of the TCP/IP protocol suite when it performs Network Address Translation (NAT), which allows multiple devices on a private network to share a single public IP address when communicating with devices on the internet.
• In addition, some routers may also provide services at the Application layer (Layer 7) of the TCP/IP protocol suite, such as acting as a Dynamic Host Configuration Protocol (DHCP) server or Domain Name System (DNS) server.
• So while a router's primary function is at the Network layer, it can also be involved in the Transport and Application layers depending on its configuration and capabilities.