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A user on your network complains that he can't get to a website by typing a human-friendly name like Sybex.com into his browser, but typing an IP address into the browser works. What client network configuration is causing the issue?

A DNS server.

On the network, DNS has only one purpose: resolving hostnames to IP addresses. A computer or phone must know the IP address of a website in order to open it. Each DNS server contains a database called a zone file that stores information about hostname-to-IP address mappings. If the network settings for a client computer's DNS server are incorrectly configured and the client is unable to access the DNS server, human-friendly names are not translated to IP addresses, resulting in the problem this user is experiencing. Authentication servers are used to determine whether a user has the required credentials to access network resources. A Microsoft domain controller is considered as an authentication server. DHCP (Dynamic Host Configuration Protocol) is a protocol that is used to automatically assign an IP address to a client based on a list (scope) of IP addresses available on the DHCP server. A proxy server lies between the client and the outside world, filtering incoming and outgoing traffic.

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