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I have two questions for you today... who has the answers?
a) A user employs outlook and encrypts their message to another user - what layer does this action occur at?
b) A user issues 2 pings - one from a from a router (while logged in) and another from a windows machine running Windows 7 - what layers does these actions occur at?
* Based on 7 Layer OSI model
2 Answers
- VPLv 76 years agoFavourite answer
From Google and Wikipedia:
a. Layer 6: Presentation Layer
The presentation layer establishes context between application-layer entities, in which the application-layer entities may use different syntax and semantics if the presentation service provides a big mapping between them. If a mapping is available, presentation service data units are encapsulated into session protocol data units, and passed down the protocol stack.
This layer provides independence from data representation (e.g., encryption) by translating between application and network formats. The presentation layer transforms data into the form that the application accepts. ----> This layer formats and encrypts data to be sent across a network. It is sometimes called the syntax layer. <----
The original presentation structure used the Basic Encoding Rules of Abstract Syntax Notation One (ASN.1), with capabilities such as converting an EBCDIC-coded text file to an ASCII-coded file, or serialization of objects and other data structures from and to XML.
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b. PING (which is really using ICMP) is a Layer 3.
- chrisjbscLv 76 years ago
Depends what you mean by the term "layer"? If you are talking about the classic 7-layer networking structure diagram, then layer 7: they are all user actions that are being taken.
