Relation between port numbers, sockets, processes, application layer protocols and network applications












1














I'm trying to find a sensible relation between the terms in the title above. I think I've come across some contradictory statements when reading on the topic (Computer Networking: A Top Down Approach). I'd be very grateful for help on rectifying the following statements/conclusions:




  1. A single port number corresponds to a single socket, which corresponds to a single application layer protocol, which corresponds to a single process.


  2. Network applications propagate across several port numbers/ sockets & potentially across several application layer protocols. Why? A network application consists of pairs of processes which send messages to each other over a network, and these are equivalent to port numbers / sockets / protocols. Plural implies there could be several.



Is distinguishing between processes which correspond to port number / socket, and (less significant) processes run by network applications the answer to 2.? By 'distinguishing' I mean as opposed to saying that 'process' is the same thing in every context.



Could I say that port number = socket = application layer protocol = process, and process can consist of many network applications which each have their own processes used for communication between end systems? (by = i mean one-to-one correspondence)










share|improve this question






















  • Did you read this answer?
    – Ron Maupin
    Nov 22 at 14:49
















1














I'm trying to find a sensible relation between the terms in the title above. I think I've come across some contradictory statements when reading on the topic (Computer Networking: A Top Down Approach). I'd be very grateful for help on rectifying the following statements/conclusions:




  1. A single port number corresponds to a single socket, which corresponds to a single application layer protocol, which corresponds to a single process.


  2. Network applications propagate across several port numbers/ sockets & potentially across several application layer protocols. Why? A network application consists of pairs of processes which send messages to each other over a network, and these are equivalent to port numbers / sockets / protocols. Plural implies there could be several.



Is distinguishing between processes which correspond to port number / socket, and (less significant) processes run by network applications the answer to 2.? By 'distinguishing' I mean as opposed to saying that 'process' is the same thing in every context.



Could I say that port number = socket = application layer protocol = process, and process can consist of many network applications which each have their own processes used for communication between end systems? (by = i mean one-to-one correspondence)










share|improve this question






















  • Did you read this answer?
    – Ron Maupin
    Nov 22 at 14:49














1












1








1







I'm trying to find a sensible relation between the terms in the title above. I think I've come across some contradictory statements when reading on the topic (Computer Networking: A Top Down Approach). I'd be very grateful for help on rectifying the following statements/conclusions:




  1. A single port number corresponds to a single socket, which corresponds to a single application layer protocol, which corresponds to a single process.


  2. Network applications propagate across several port numbers/ sockets & potentially across several application layer protocols. Why? A network application consists of pairs of processes which send messages to each other over a network, and these are equivalent to port numbers / sockets / protocols. Plural implies there could be several.



Is distinguishing between processes which correspond to port number / socket, and (less significant) processes run by network applications the answer to 2.? By 'distinguishing' I mean as opposed to saying that 'process' is the same thing in every context.



Could I say that port number = socket = application layer protocol = process, and process can consist of many network applications which each have their own processes used for communication between end systems? (by = i mean one-to-one correspondence)










share|improve this question













I'm trying to find a sensible relation between the terms in the title above. I think I've come across some contradictory statements when reading on the topic (Computer Networking: A Top Down Approach). I'd be very grateful for help on rectifying the following statements/conclusions:




  1. A single port number corresponds to a single socket, which corresponds to a single application layer protocol, which corresponds to a single process.


  2. Network applications propagate across several port numbers/ sockets & potentially across several application layer protocols. Why? A network application consists of pairs of processes which send messages to each other over a network, and these are equivalent to port numbers / sockets / protocols. Plural implies there could be several.



Is distinguishing between processes which correspond to port number / socket, and (less significant) processes run by network applications the answer to 2.? By 'distinguishing' I mean as opposed to saying that 'process' is the same thing in every context.



Could I say that port number = socket = application layer protocol = process, and process can consist of many network applications which each have their own processes used for communication between end systems? (by = i mean one-to-one correspondence)







networking






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 22 at 14:28









Marek Zakrzewski

186




186












  • Did you read this answer?
    – Ron Maupin
    Nov 22 at 14:49


















  • Did you read this answer?
    – Ron Maupin
    Nov 22 at 14:49
















Did you read this answer?
– Ron Maupin
Nov 22 at 14:49




Did you read this answer?
– Ron Maupin
Nov 22 at 14:49

















active

oldest

votes











Your Answer






StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});














draft saved

draft discarded


















StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53433114%2frelation-between-port-numbers-sockets-processes-application-layer-protocols-a%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown






























active

oldest

votes













active

oldest

votes









active

oldest

votes






active

oldest

votes
















draft saved

draft discarded




















































Thanks for contributing an answer to Stack Overflow!


  • Please be sure to answer the question. Provide details and share your research!

But avoid



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.





Some of your past answers have not been well-received, and you're in danger of being blocked from answering.


Please pay close attention to the following guidance:


  • Please be sure to answer the question. Provide details and share your research!

But avoid



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53433114%2frelation-between-port-numbers-sockets-processes-application-layer-protocols-a%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







Popular posts from this blog

Berounka

Sphinx de Gizeh

Different font size/position of beamer's navigation symbols template's content depending on regular/plain...