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A host is trying to access www.cisco.com. The user has no more information except for the name. Without an IP destination, the webpage is impossible to access. What service is used to solve this?
OSPF
DNS
NAT
ARP
DHCP
Domain Name Server (DNS) resolve domain names (hostnames) to IP addresses. The purpose of DNS is so users can easily memorize hostnames instead of IP addresses. DNS works with DNS Query and DNS response messages. ARP is a protocol that resolves MAC addresses with known IP addresses. OSPF (Open Shortest Path First) is a link state routing protocol, which uses Dijkstra algorithm to build a shortest path tree and populate the routing table with the best routes. Network Address Translation (NAT), can be used when a host needs to connect to the Internet and the IP being used is not globally unique but private. DHCP is used for dynamic host configuration. For more information refer to: [Todd Lammle. - CCNA Routing and Switching Study Guide 2013, Chapter 3]
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