DNS Lookups in Network Workflows
A DNS lookup is the initial step in practical network interactions, such as loading a web page in a browser. When a user enters a domain name like example.com into an address bar and presses Enter, the client device immediately queries a DNS server to obtain the destination IP address associated with that name.
Only after the DNS server resolves the domain name into an IP address can subsequent network actions proceed. The client uses the retrieved IP address to initiate the three-way TCP handshake, establish TLS encryption for HTTPS, and send HTTP requests to load website resources.
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Prep Sessions
Demystifying Network Architecture: Protocols, Addressing, and Packet Flow @ University of Michigan - Ann Arbor
Ch.2 Addressing and Resolution Services - Demystifying Network Architecture: Protocols, Addressing, and Packet Flow @ University of Michigan - Ann Arbor
Domain Name System Functionality - Demystifying Network Architecture: Protocols, Addressing, and Packet Flow @ University of Michigan - Ann Arbor
Learn After
Which step must be completed before a client device can initiate a three-way TCP handshake to load a web page?
A client device can establish TLS encryption and send HTTP requests before the DNS server resolves the domain name into an IP address.
What specific destination information does a client query a DNS server to obtain when a user enters a domain name into an address bar?
Explain the role of a DNS lookup when a user enters a domain name into a browser, and describe the sequence of network actions that depend on this lookup being completed.