0
votes
1answer
63 views

Are all internet file downloads using FTP protocol?

I heard, FTP is used to transfer files over a network. Also heard that it uses TCP port 20 and 21. So TCP is connection oriented. We have acknowledgments. If the transmission is lost, we should be ...
1
vote
1answer
482 views

Is it possible for a PC to use two net connections simultaneously?

We have two net connections in our office - a 10mb Wired DSL provider and a 3mb Wireless backup provider. The wireless is a backup, but it has the advantage of 3mb upload speeds whereas the wired is ...
0
votes
1answer
267 views

TCPview: Some strange process?

I just install the TCPview to check if there are any abnormalities in my computer connections, and there are something looks strange: There are 2-3 process that show the following status from time to ...
1
vote
2answers
294 views

Download resume support blocked by isp?

Can ISP block resume support for downloads ? I'm using IDM (internet download manager) to download of the internet from resume supported websites, yet I am unable to resume downloads. I tried ...
4
votes
1answer
829 views

What is the purpose of ports?

I have a few questions in regard to the following explanation of ports I found. The Application layer talks to the Transport layer through a port. Ports are numbered and standard ...
1
vote
2answers
1k views

Hardware/Software behind IP/TCP layers encapsulation

Every tutorial I read talks about how the layers "communicate" with each other, but never mentions what hardware/software receives, adds on, and sends each layer of control data. What piece of ...
9
votes
3answers
861 views

What do the numbers used in a IPV6 address mean?

I am trying to understand IPV6. I have a server with the following IPV6 address: 2607:f750:0:3f::f59. I don't understand what the numbers mean. It looks totally different from an IPV4 address. ...
4
votes
3answers
9k views

TCP Retransmission vs. TCP Fast Retransmission

In Wireshark I can see things that say "TCP Retransmission" and "TCP Fast Retransmission." What's the difference? How is Wireshark able to tell the difference?
1
vote
1answer
349 views

Server response in TCP 3-way handshake

A server normally responds with SYN ACK in a 3-way handshake. What would happen if it just responded with ACK?
3
votes
2answers
720 views

How to manually do a TCP handshake

Telnet can be used to manually do things that programs do automatically. When I connect to a server I noticed that it automatically does the 3-way handshake to establish a TCP connection. Can it be ...
1
vote
2answers
102 views

ICMP protocol place in network layers

I would like to ask you question about Internet Protocol. On Wikipedia, they have ICMP protocol on the same level of network architecture as IP protocol, but that is wrong, right? ICMP should be on ...