TCP is a protocol that uses those.
TCP
The protocol that uses port numbers 67 and 68 is the Dynamic Host Configuration Protocol (DHCP). Port 67 is used by the DHCP server to receive client requests, while port 68 is used by the DHCP client to receive responses from the server. This protocol is essential for dynamically assigning IP addresses and other network configuration parameters to devices on a network.
I believe Skype uses UDP or User Datagram Protocol.
TCP uses the acknowledgement number in segments sent back to the source to indicate the next byte in this session that the receiver expects to receive. This is called expectational acknowledgement.
That depends on the protocols used. TCP provides reliability, but if TCP is not used, higher-level protocols can include the reliability instead. That is to say, if a packet is not received, the higher-level protocol will take the responsibility of sending (or requesting) the packet again.For example, TFTP (Trivial File Transfer Protocol) uses UDP, and automatically resends a packet when an acknowledgement is not received after a certain time.That depends on the protocols used. TCP provides reliability, but if TCP is not used, higher-level protocols can include the reliability instead. That is to say, if a packet is not received, the higher-level protocol will take the responsibility of sending (or requesting) the packet again.For example, TFTP (Trivial File Transfer Protocol) uses UDP, and automatically resends a packet when an acknowledgement is not received after a certain time.That depends on the protocols used. TCP provides reliability, but if TCP is not used, higher-level protocols can include the reliability instead. That is to say, if a packet is not received, the higher-level protocol will take the responsibility of sending (or requesting) the packet again.For example, TFTP (Trivial File Transfer Protocol) uses UDP, and automatically resends a packet when an acknowledgement is not received after a certain time.That depends on the protocols used. TCP provides reliability, but if TCP is not used, higher-level protocols can include the reliability instead. That is to say, if a packet is not received, the higher-level protocol will take the responsibility of sending (or requesting) the packet again.For example, TFTP (Trivial File Transfer Protocol) uses UDP, and automatically resends a packet when an acknowledgement is not received after a certain time.
Sequence of numbers such that difference of any two successive member of the sequence is constant.Such as.....3,5,7,9........ Here in this example 2 is constant.
The IMAP (Internet Message Access Protocol) email protocol usually uses port 143.
It uses ICMP.
Facebook uses the HTTP Protocol
address resolution protocol and reverse address resolution protocol
The standard port numbers for the specified protocols are as follows: SMTP (Simple Mail Transfer Protocol) uses port 25, POP3 (Post Office Protocol version 3) uses port 110, IMAP4 (Internet Message Access Protocol version 4) uses port 143, RPC (Remote Procedure Call) commonly uses port 135, LDAP (Lightweight Directory Access Protocol) operates on port 389, and the Global Catalog service typically uses port 3268. These ports facilitate various email and directory services in network communications.
A sequence of numbers that uniquely identifies the location of each computer or device connected to the Internet is called an IP address (Internet Protocol address). It serves as a unique identifier for each device, allowing for communication and data exchange over the network. IP addresses can be either IPv4, which consists of four sets of numbers separated by periods, or IPv6, which uses a longer format to accommodate a larger number of devices.