Cisco Certified Support Technician (CCST) NetworkingNetworking FundamentalsHard
A network engineer is configuring a router to connect a corporate network to the internet. The router needs to translate private IP addresses used within the corporate network to a single public IP address when communicating with external hosts. Which specific function is being configured on the router?
- AARP (Address Resolution Protocol)
- BDHCP (Dynamic Host Configuration Protocol)
- CDNS (Domain Name System)
- DNAT (Network Address Translation)
Show answer & explanationAnswer & explanation
Correct answer: D. NAT (Network Address Translation)
Network Address Translation (NAT) is the specific function that allows multiple devices on a private network to share a single public IP address when accessing the internet. It translates private IP addresses to a public one and vice versa, which is essential for conserving IPv4 public addresses and providing a layer of security.
Why the other options are wrong
- A. ARP resolves IP addresses to MAC addresses within a local network segment; it is not involved in private-to-public IP address translation.
- B. DHCP automatically assigns IP addresses to devices on a network; it does not translate addresses for internet access.
- C. DNS translates domain names into IP addresses; it is not involved in private-to-public IP address translation.
Network Address Translation (NAT)
NAT is a method of remapping one IP address space into another by modifying network address information in the IP header of packets while they are in transit across a traffic routing device.
- Primarily used to conserve public IPv4 addresses.
- Allows multiple private IP addresses to share a single public IP.
- Provides a basic form of security by hiding internal network structure.
Memory trick: NAT is the Name for Address Translation.