Ccna-guidance.blogspot.com Website Review

this blog is intend to share some guidance to understand knowledge in cisco ccna level. concept of the guidance is based on cisco ccna 640-802 exam topics or blue print of the exam. please note, that i am not offering you cheat sheet ccna 640-802, but once again i just want to share my knowledge in cisco ccna level, so it can be usefull in real world. internetwork. a port can identify a specific process to which a computer or other network message need to be forwarded when it arrives a port number is 16 bit that will append to header of message unit. 16 bit mean 2^16 equal to 65536 ports (0 to 65535). based on the protocol, port can be categorize to transmission control protocol (tcp) and user datagram protocol (udp). ordered delivery of stream. major internet application rely on tcp, such as www, e-mail, ftp, etc. guaranteeing reliability, ordering, or data integrity. udp provides an unreliable transmission, a datagrams may arrive out of order, duplicated, or can go missing without any notice to sender nor receiver. no error checking and error correction performed to avoiding overhead processing at network. udp mostly used by time sensitive application that prefer dropping packet than waiting for delay (opposed to tcp transmission). because of this nature, udp is very usefull for servers that answer small queries from huge number of clients. common application : domain name system (dns), voice over ip (voip), trivial file transfer protocol (tftp), etc. based on the numbering, tcp and udp divided into 3 categories : according to internet as*igned number authority (iana), well-known port numbers are port 0 to 1023. this list specifies the port used by range 1024 to 49151. these ports used by computer vendors for their applications and operating systems. registered port also register to there are many tcp and udp ports number that can be found in iana site. but lets make it easy, with some list of common tcp and udp you can find more common tcp and udp ports by identifying your day to day basis application port number, such as network time protocol