OBJ 1.5 X Flashcards
File Transfer Protocol (FTP) 20/21
▪ Transfers computer files between a client and server on a computer
network
▪ Unsecure method
▪ Data transferred in the clear
Secure Shell (SSH) 22
▪ Cryptographic network protocol for operating network services securely
over an unsecured network
▪ Best known for remote login to computer systems by users
Secure File Transfer Protocol (SFTP) 22
▪ Provides file access, file transfer, and file management over any
reliable data stream
Telnet 23
▪ Provides bidirectional interactive text-oriented communication facility
using a virtual terminal connection
▪ Like SSH, but insecure
Simple Mail Transfer Protocol (SMTP) 25
▪ Internet standard for sending electronic mail
▪ RFC 821 was defined originally in 1982
▪ RFC 5321 developed in 2008 (current version)
Domain Name System (DNS) 53
Hierarchical decentralized naming system for computers, services, or
other resources connected to the Internet or a private network
▪ Converts domain names to IP addresses
Dynamic Host Configuration Protocol (DHCP) 67/68
▪ DHCP server dynamically assigns an IP address and other network
configuration parameters to a client
▪ Enables computers to request IP addresses and networking parameters
automatically?
▪ Reduces burden on network administrators
Trivial File Transfer Protocol (TFTP) 69
▪ Transmits files in both directions of a client-server application
▪ Used for booting an operating system from a local area network file
server
▪ Doesn’t provide user authentication or directory visibility
▪ Essentially a stripped-down version of FTP
Hypertext Transfer Protocol (HTTP) 80
▪ Foundation of data communication for WWW
▪ Designed for distributed, collaborative, and hypermedia presentation
across many devices
Post Office Protocol v3 (POP3) 110
▪ Used by local e-mail clients to retrieve e-mail from a remote server over
TCP/IP connection
Network Time Protocol (NTP) 123
▪ Provides clock synchronization between computer systems over packetswitched, variable-latency data networks
▪ Created in 1985, one of the oldest Internet protocols in current use
Internet Message Access Protocol (IMAP) 143
▪ Provides e-mail clients to retrieve e-mail messages from a mail server
over a TCP/IP connection
▪ Allows the end user to view and manipulate the messages as if they’re
stored locally
Simple Network Management Protocol (SNMP) 161/162
▪ Provides collection and organization of information about managed
devices on IP networks
▪ Can modify that information to change device behavior, commonly used
in network devices
Lightweight Directory Access Protocol (LDAP) 389
Open, vendor-neutral, industry standard for accessing and maintaining
distributed directory information services
▪ LDAP and Active Directory use this port
Hypertext Transfer Protocol Secure (HTTPS) [Secure Sockets Layer (SSL)] 443
▪ Foundation of ecommerce on WWW
▪ Designed for adding security to the insecure HTTP protocol
Server Message Block (SMB) 445
Provides shared access to files, printers, and miscellaneous
communications between devices on a network
Syslog 514
Used to send logging data back to a centralized server
SMTP TLS 587
▪ Secure and encrypted way to send emails
Lightweight Directory Access Protocol (over SSL) (LDAPS) 636
▪ Open, vendor-neutral, industry standard for accessing and maintaining
distributed directory information services
Provides secure directory services
IMAP over SSL 993
▪ Secure and encrypted way to receive emails
POP3 over SSL 995
▪ Secure and encrypted way to receive emails
Structured Query Language (SQL) Server 1433
▪ Used for communication from a client to the database engine
SQLnet 1521
Used for communication from a client to an Oracle database
MySQL 3306
Used for communication from a client to the MySQL database engine
Remote Desktop Protocol (RDP) 3389
Proprietary protocol developed by Microsoft
▪ Provides a user with a graphical interface to connect to another
computer over a network connection
▪ User employs RDP client software for this purpose and the other
computer must run RDP server software
Session Initiation Protocol (SIP) 5060/5061
Provides signaling and controlling multimedia communication sessions in
applications
▪ Used for Internet telephony for voice and video calls, VOIP, and instant
messaging
Internet Control Message Protocol (ICMP)
A network level protocol that is used to communicate information about network connectivity issues back to the sender.
▪ ICMP is used a lot by network technicians during troubleshooting, but it is also used by attackers to conduct ping scans and network mapping
Generic Routing Encapsulation protocol (GRE)
A tunneling protocol that was developed by Cisco to encapsulate a wide
variety of network layer protocols inside a virtual point-to-point or pointto-multipoint link over an Internet Protocol network
▪ Important to set a smaller maximum transmission unit or MTU size on
the tunnel
▪ It does not provide any encryption
Internet Protocol Security protocol (IPsec)
▪ Set of secure communication protocols at the network or packet
processing layer that is used to protect data flows between peers
Authentication Header (AH)
o A protocol within IPSec that provides integrity and
authentication
Encapsulating security payload (ESP)
o Provides encryption and integrity for the data packets sent over IPsec
o Backwards-compatible with most IP routers including those that were not designed to work with IPsec initially
