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?

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.