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CompTia A+ > Ports > Flashcards

Ports Flashcards

1
Q

Port 23

A
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2
Q

Port 20

A

FTP (can copy files, list & manipulate directories, & view file contents). Port 20 is for FTP data transfer

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3
Q

Port 21

A

FTP (copy files, list & manipulate directories, view file contents) - file management

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4
Q

Port 22

A

SSH (Secure Shell) - connection - oriented protocol

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5
Q

Port 23

A

Telnet (terminal emulation program)

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6
Q

Port 25

A

SMTP (simple mail transfer protocol) - push protocol; SEND email ONLY

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7
Q

Port 53

A

Domain Name System (DNS)

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8
Q

Port 67/68

A

DHCP (Dynamic Host Configuration Protocol) - Port 67 for SERVER, Port 68 for CLIENT

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9
Q

Port 80

A

HTTP (Hypertext Transfer Protocol)

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10
Q

Port 110

A

POP3 (Post Office Protocol 3) - DOWNLOADING email.

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11
Q

Port 137 (& 139)

A

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.

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12
Q

Port 139 (& 137)

A

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.

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13
Q

Port 143

A

IMAP4 (Internet Message Access Protocol) - DOWNLOADING email. SECURE protocol.

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14
Q

Port 161/162

A

SNMP (Simple Network Management Protocol) - used for network management. Port 161 for sending & receiving requests, and Port 162 for receiving transmissions from managed devices.

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15
Q

Port 389

A

LDAP (Lightweight Directory Access Protocol) - accessing info from an info directory.

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16
Q

Port 443

A

HTTPS (Hypertext Transfer Protocol Secure)

17
Q

Port 445

A

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.

18
Q

Port 3389

A

RDP (remote desktop protocol)

19
Q

Port 69

A

TFTP (Trivial File Transfer Protocol) - faster version of FTP using UDP instead of TCP.

20
Q

What OSI layer do routers work on?

A

Layer 3 (Network).

21
Q

What do routers do?

A

Connect multiple network devices & determine best traffic path using routing tables.
Breaks up broadcast domains
Connects one LAN to another LAN on a WAN

22
Q

What OSI layer are switches?

A

Commonly Layer 2 (Data Link); examines headers for MAC addresses & forwards appropriately.

23
Q

What’s the difference between a managed & an unmanaged switch?

A

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.

24
Q

Can a managed switch differentiate by VLAN?

A

Yes

25
Q

2 examples of wired access points

A

Hubs
Switches

26
Q

What is an injector?

A

Midspan device that sits between the switch & access point to supply power via an ethernet connection

27
Q

What OSI layer is a hub?

A

Layer 1 (physical). dumb device that sneds all incoming data to all connected devices in a broadcast. Also known as a multiport repeater.

28
Q

Digital Subscriber Line (DSL)

A

DSL modem provides connectivity via a telephone line

29
Q

Optical Network Terminal (ONT)

A

ONT modem provides connectivity via a fiber-optic line

30
Q

Is a network interface card (NIC) the same as a network adapter card?

A

Yes

31
Q

What does a NIC do?

A

Physical interface between a computer & the cabling used for connectivity.

32
Q

SDN (software-defined networking)

A

sets up a network virtually via the cloud. Replaces router functions.

33
Q

Anatomy of an Ethernet packet:

A

Destination MAC address, source MAC address, data, FCS (frame check sum)

34
Q

What is a display adapter?

A

Software that controls the output function of the display

35
Q

What is a digitizer?

A

Hardware overlaid on a display screen to make it responsive to touch / user input.

36
Q

What is an FPD?

A

Flat-panel display

37
Q

What is a modem?

A

Converts analog to digital or visa versa

38
Q

What kind of connector does a NIC (Network interface card) use?

A

RJ-45

39
Q

What type of connector does a dial-up modem use?

A

RJ-11

CompTia A+ (7 decks)

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