8 Port ? 20 & 21: File Transfer Protocol (FTP) 22: Secure Shell (SSH) TCP and UDPPort Number20 & 21: File Transfer Protocol (FTP)22: Secure Shell (SSH)23: Telnet remote login service25: Simple Mail Transfer Protocol (SMTP)53: Domain Name System (DNS) service80: Hypertext Transfer Protocol (HTTP) used in the World Wide Web110: Post Office Protocol (POP3)119: Network News Transfer Protocol (NNTP)143: Internet Message Access Protocol (IMAP)161: Simple Network Management Protocol (SNMP)443: HTTP Secure (HTTPS)
10 Size of network number bit field Public IPClassLeading bitsSize of network number bit fieldSize of rest bit fieldNumber of networksAddresses per networkStart addressEnd addressClass A 0 8 24 128 (27) 16,777,216 (224)Class B 10 16 16,384 (214) 65,536 (216)Class C 110 2,097,152 (221) 256 (28)Class D (multicast) 1110 not definedClass E (reserved) 1111
11 Private IP LAN (Local Area Network) Class A 10.x.x.x Class B 172.x.x.x Class C x.x
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