port numbers Flashcards
A client packet is received by a server. The packet has a destination port number of 137. What service application is the client requesting?
NetBIOS NetBIOS (Network Basic Input/Output System) is a program that allows applications on different computers to communicate within a local area network (LAN). It was created by IBM for its early PC Network, was adopted by Microsoft, and has since become a de facto industry standard.
A client packet is received by a server. The packet has a destination port number of 22. What service application is the client requesting?
SSH (SSH, also known as Secure Shell or Secure Socket Shell, is a network protocol that gives users, particularly system administrators, a secure way to access a computer over an unsecured network. In addition to providing secure network services, SSH refers to the suite of utilities that implement the SSH protocol.)
A client packet is received by a server. The packet has a destination port number of 143. What service application is the client requesting?
IMAP.
IMAP allows you to access your email wherever you are, from any device. When you read an email message using IMAP, you aren’t actually downloading or storing it on your computer; instead, you’re reading it from the email service.
A client packet is received by a server. The packet has a destination port number of 23. What service application is the client requesting?
Telnet
Telnet, developed in 1969, is a protocol that provides a command line interface for communication with a remote device or server, sometimes employed for remote management but also for initial device setup like network hardware.
A client packet is received by a server. The packet has a destination port number of 161. What service application is the client requesting?
SNMP
Simple Network Management Protocol (SNMP) is an Internet Standard protocol for collecting and organizing information about managed devices on IP networks and for modifying that information to change device behavior.
A client packet is received by a server. The packet has a destination port number of 389. What service application is the client requesting?
LDAP
LDAP (Lightweight Directory Access Protocol) is an open and cross platform protocol used for directory services authentication. LDAP provides the communication language that applications use to communicate with other directory services servers.
A client packet is received by a server. The packet has a destination port number of 25. What service application is the client requesting?
SMTP
SMTP or Simple Mail Transfer Protocol is an application that is used to send, receive, and relay outgoing emails between senders and receivers. When an email is sent, it’s transferred over the internet from one server to another using SMTP. In simple terms, an SMTP email is just an email sent using the SMTP server.
A client packet is received by a server. The packet has a destination port number of 427. What service application is the client requesting?
SLP
The Service Location Protocol (SLP, srvloc) is a service discovery protocol that allows computers and other devices to find services in a local area network without prior configuration. SLP has been designed to scale from small, unmanaged networks to large enterprise networks.
A client packet is received by a server. The packet has a destination port number of 53. What service application is the client requesting?
DNS DNS (Domain name system) translates domain names to IP addresses so browsers can load Internet resources. Each device connected to the Internet has a unique IP address which other machines use to find the device. DNS servers eliminate the need for humans to memorize IP addresses such as 192.168.
Which port number is used by Virtual Network Computing (VNC) to provide remote screen sharing between devices?
5900 (Virtual Network Computing (VNC) is a freeware product that is similar in functionality to RDP and works over port 5900
A client packet is received by a server. The packet has a destination port number of 67. What service application is the client requesting?
DHCP
A client packet is received by a server. The packet has a destination port number of 443. What service application is the client requesting?
HTTPS
A client packet is received by a server. The packet has a destination port number of 69. What service application is the client requesting?
TFTP (Trivial File Transfer Protocol is a technology that transfers files between network devices and is a simplified version of the more robust File Transfer Protocol. TFTP was developed in the 1970s for computers lacking sufficient memory or disk space to provide full FTP support.)
A client packet is received by a server. The packet has a destination port number of 445. What service application is the client requesting?
SMB/CIFS (In computer networking, Server Message Block (SMB), one version of which was also known as Common Internet File System (CIFS / sɪfs /), is a communication protocol for providing shared access to files, printers, and serial ports between nodes on a network. It also provides an authenticated inter-process communication (IPC) mechanism.)
A client packet is received by a server. The packet has a destination port number of 548. What service application is the client requesting?
AFP (AFP is a protocol developed by Apple for sharing files over a network. It was used in early versions of Apple’s Macintosh operating systems and is also supported in macOS 10. However, AFP has mostly been replaced by the standard SMB (Server Message Block) protocol.)
