Which of the following uses port 443?

• 200-201 : All Parts

Port number 22 is reserved for Secure Shell (SSH) remote login.

Telnet uses port 23. Telnet is a terminal emulation protocol. You can use Telnet to establish a remote session with a server and to issue commands on a server. Telnet client software provides you with a text-based interface and a command line from which you can issue commands on a server that supports the Telnet protocol. Telnet works at the Application layer of the OSI model.

HTTP uses port 80. HTTP is used to traverse web pages.

DNS uses port 53. Domain Name System (DNS) is the protocol that will manage the FQDN to IP address mappings.

There are a total of 65,535 ports in the TCP/IP protocol that are vulnerable to attacks. The following are the most commonly used ports and protocols:

– FTP – ports 20 and 21
– SSH, SCP, and SFTP – port 22
– Telnet – port 23
– SMTP – port 25
– TACACS – port 49
– DNS server – port 53
– DHCP – port 67 and 68
– TFTP – port 69
– HTTP – port 80
– Kerberos – port 88
– POP3 – port 110
– NetBIOS – ports 137-139
– IMAP4 – port 143
– SNMP – port 161
– LDAP – port 389
– SSL and HTTPS – port 443
– SMB – port 445
– LDAP with SSL – port 636
– FTPs – ports 989, 990
– Microsoft SQL Server – port 1433
– Point-to-Point Tunneling Protocol (PPTP) – port 1723
– RDP protocol and terminal Services – port 3389

Objective: Cryptography
Sub-Objective: Describe the security impact of these commonly used encryption algorithms and secure communications protocols: DES, 3DES, AES, AES256-CTR, RSA, DSA, SSH, SSL/TLS