Cisco Certified Support Technician (CCST) NetworkingNetworking FundamentalsEasy
A network technician is configuring a new router to connect a corporate network to the internet. The corporate network uses private IP addresses, and the router needs to translate these private addresses into a single public IP address for all outbound internet traffic. Which technology is required for this function?
- ADHCP (Dynamic Host Configuration Protocol)
- BVPN (Virtual Private Network)
- CNAT (Network Address Translation)
- DDNS (Domain Name System)
Show answer & explanationAnswer & explanation
Correct answer: C. NAT (Network Address Translation)
Network Address Translation (NAT) is used to translate private IP addresses within a local network to a public IP address when communicating with external networks like the internet, conserving public IP addresses.
Why the other options are wrong
- A. DHCP assigns IP addresses to devices dynamically, not for translating private to public IPs.
- B. VPN creates a secure, encrypted connection over a public network, not for IP address translation.
- D. DNS translates domain names to IP addresses, not for address translation between private and public networks.
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.
- Conserves public IPv4 addresses.
- Provides a layer of security by hiding internal network topology.
- Typically performed by routers or firewalls at the edge of a network.
Memory trick: NAT: Narrows Addresses to the Internet.