Which of these functions as an application layer network service?
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Answer: D. All of these
Explanation
The application layer supports diverse network services including virtual terminals and email. File transfer protocols also operate directly within this topmost network abstraction layer. All these listed protocols function as standard application layer network services. Application layer protocols provide direct interfaces between user software and the network. Email systems use SMTP while file transfers rely on FTP at this network level. Remote login utilities provide network virtual terminal access across distant servers.
Internet users access web pages, send emails, and transfer files via application services. Network administrators configure application layer protocols to manage enterprise communication. Software developers write network applications utilizing standard application layer interfaces. Isolating only terminal access ignores file transfer and email service capabilities. Focusing exclusively on file transfer misses terminal emulation and mail services. Single-service choices fail because the protocol suite encompasses all listed network tools.
- Subject
- Computer Science
- Category
- Software Engineering
- Topic
- —
- Difficulty
- medium
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