Ports Flashcards
Port 23
Port 20
FTP (can copy files, list & manipulate directories, & view file contents). Port 20 is for FTP data transfer
Port 21
FTP (copy files, list & manipulate directories, view file contents) - file management
Port 22
SSH (Secure Shell) - connection - oriented protocol
Port 23
Telnet (terminal emulation program)
Port 25
SMTP (simple mail transfer protocol) - push protocol; SEND email ONLY
Port 53
Domain Name System (DNS)
Port 67/68
DHCP (Dynamic Host Configuration Protocol) - Port 67 for SERVER, Port 68 for CLIENT
Port 80
HTTP (Hypertext Transfer Protocol)
Port 110
POP3 (Post Office Protocol 3) - DOWNLOADING email.
Port 137 (& 139)
NetBIOS / NetBIOS over TCP/IP (NetBT)
Network Basic Input/Output System
is an API (application programming interface) for communication between computers over a network. NetBIOS works on Layer 4 (Transport) but needs Layer 5 (Session) (TCP/IP) to function properly.
Port 139 (& 137)
NetBIOS / NetBIOS over TCP/IP (NetBT)
Network Basic Input/Output System
is an API (application programming interface) for communication between computers over a network. NetBIOS works on Layer 4 (Transport) but needs Layer 5 (Session) (TCP/IP) to function properly.
Port 143
IMAP4 (Internet Message Access Protocol) - DOWNLOADING email. SECURE protocol.
Port 161/162
SNMP (Simple Network Management Protocol) - used for network management. Port 161 for sending & receiving requests, and Port 162 for receiving transmissions from managed devices.
Port 389
LDAP (Lightweight Directory Access Protocol) - accessing info from an info directory.
Port 443
HTTPS (Hypertext Transfer Protocol Secure)
Port 445
SMB (Server Message Block) / CIFS (Common Internet File System) .
SMB is primarily a Microsoft protocol for shared file access. CIFS is an enhanced version of SMB.
Port 3389
RDP (remote desktop protocol)
Port 69
TFTP (Trivial File Transfer Protocol) - faster version of FTP using UDP instead of TCP.
What OSI layer do routers work on?
Layer 3 (Network).
What do routers do?
Connect multiple network devices & determine best traffic path using routing tables.
Breaks up broadcast domains
Connects one LAN to another LAN on a WAN
What OSI layer are switches?
Commonly Layer 2 (Data Link); examines headers for MAC addresses & forwards appropriately.
What’s the difference between a managed & an unmanaged switch?
An unmanaged switch does not allow for configuration & passes all data for a MAC address to its ports.
Managed switches allow for port configuration, traffic management, traffic monitoring as well as quality of service (QoS), redundancy, port mirroring, & VLANS.
Can a managed switch differentiate by VLAN?
Yes
2 examples of wired access points
Hubs
Switches
What is an injector?
Midspan device that sits between the switch & access point to supply power via an ethernet connection
What OSI layer is a hub?
Layer 1 (physical). dumb device that sneds all incoming data to all connected devices in a broadcast. Also known as a multiport repeater.
Digital Subscriber Line (DSL)
DSL modem provides connectivity via a telephone line
Optical Network Terminal (ONT)
ONT modem provides connectivity via a fiber-optic line
Is a network interface card (NIC) the same as a network adapter card?
Yes
What does a NIC do?
Physical interface between a computer & the cabling used for connectivity.
SDN (software-defined networking)
sets up a network virtually via the cloud. Replaces router functions.
Anatomy of an Ethernet packet:
Destination MAC address, source MAC address, data, FCS (frame check sum)
What is a display adapter?
Software that controls the output function of the display
What is a digitizer?
Hardware overlaid on a display screen to make it responsive to touch / user input.
What is an FPD?
Flat-panel display
What is a modem?
Converts analog to digital or visa versa
What kind of connector does a NIC (Network interface card) use?
RJ-45
What type of connector does a dial-up modem use?
RJ-11
