Computer Networks, unit: The Application Layer. Core concepts, terminology, and worked-example cues a college student meets for this unit, building on prior units without repeating them. Front: a term, concept, or short problem cue. Back: the definition, explanation, or answer.
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- What is the Application layer responsible for?
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Providing network-aware services directly usable by end-user software- What is HTTP (Hypertext Transfer Protocol)?
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The protocol used for transferring web pages and resources over the internet- What is HTTPS?
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HTTP secured with encryption, typically using TLS/SSL- What is FTP (File Transfer Protocol)?
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A protocol used for transferring files between a client and server- What is SMTP (Simple Mail Transfer Protocol)?
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The protocol used for sending email between mail servers- What is DNS (Domain Name System)?
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A system that translates human-readable domain names into IP addresses- What is a DNS resolver?
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A component that looks up a domain name and returns its corresponding IP address- What is DHCP (Dynamic Host Configuration Protocol)?
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A protocol that automatically assigns IP addresses and network settings to devices- What is a URL?
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A web address specifying the protocol, domain, and path to a specific resource- What is a client-server model?
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An architecture where clients request services and servers provide them- What is peer-to-peer (P2P) networking?
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An architecture where devices communicate directly as equals, without a central server- What is a web server?
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Software that responds to HTTP requests by serving web content- What is a REST API?
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An architectural style for web services using standard HTTP methods to access resources- What are common HTTP methods?
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GET, POST, PUT, DELETE, and others used to specify the desired action on a resource- What is an HTTP status code?
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A three-digit code indicating the result of an HTTP request, such as 200 (success) or 404 (not found)
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