comptia A+

tcp/20

ftp active data

tcp 21

ftp control

how does ftp authenticate

ftp authenticates with a username and password or a generic. anonymous login

what does ssh do

encrypts data when sending it from one side to another

ssh looks and acts like what other protocol

telnet

tcp 23

telnet

is ssh or tel net un encrypted

telbet

what proticol is used for server to server email transfer

smtp

tcp 25

smtp

what protocol is used to send mail from a device to a mail server

smtp

udp 53

dns

what does dns do

dns converts names to ip addresses

wha does dhcp do

automated configuration of ip address

udp 67

dhcp

udp 68

dhcp

tcp 80

http

tcp 443

https

tcp 110

pop3

tcp143

imap4

what does pop3 do

transfer email from email sever to your phone

what does imap4 do

transfer mail from mail server to device aswell as managment of email inbox from multiple clients

what is smb used for

file sharing printer sharing used by windwos

what is cifs another name for

smb

udp 137

nbname

tcp 139

nbsession

tcp 445

net bios less

what is netBIOS-less

direct smb communication over tcp with the netbios transport

ldap/ ldaps

store and retrive information in a network directory

what is ldap commonly used in

Microsoft active directory

tcp 3389

rdp

802.11ac is what wifi

wifi 5

what is 802.11ax

wifi 6 and wifi 6e

802.11be

wifi 7

what are the frequencies of wifi networks

2.4 ,5, 6

what are channels

groups of frequencies

frequencies are managed by who

frequencies are managed by governing entities

does 2.4 ghz provide alot of frequencies

no

2.4 mghz channels

20

5 ghz frequencies

20 40 80 160

6ghz frequencies

20 40 80 160 320

bluetooth uses what ghz range

2.4

a record are for what ip address type

ipv4

aaaa record are wfor what type of ip address

ipv6

what does mx records do

determines echanger record

in mx mail.example.com

what type of dns record is this

what is dora used for

dora is a four step process to lease an ip address to a device

what does dora stand for discover offer request acknowledgement

discover offer request acknowledgement

what do routers do

route traffic between ip subnets

poe

15.4 watts dc power 350 ma max current

poe+

25.5 watts dc power 600 ma max current

POE++

• 51 W (Type 3), 600 mA max current

• 71.3 W (Type 4), 960 mA max current

• PoE with 10GBASE-T

dsl uses what lines

dsl uses telephone lines

explain the download speeds with dsl

• Asymmetric: Download speed is faster than upload speed.

• Typical speeds: ~200 Mbps down / 20 Mbps up.

• Distance limit: About 10,000 ft (3 km) from the Central Office (CO).

• Closer to the CO = Faster speeds (less signal attenuation).

what is a ont

What an ONT does

1. Receives light signals over a fiber-optic cable.

2. Converts them into Ethernet (and sometimes phone/TV) signals.

3. Connects to your router, which then provides Wi-Fi and wired network access.

what is the ip address range for class a private ip addresses

10.0.0-10.255.255.255

what is the ip address range for class b private ip addresses

172.16.0.0-172.31.255.255

what is the ip address range for class c private ip addresses

192.168.0.0 -192.168.255.255

number of addresses in class a private ip addresses

16,777,216

number of addresses in class b private ip addresses

1,048,576

number of addresses in class c private ip addresses

65536

what is a subnet mask

used by the local device to determine what subnet its on

what are the common transfer rates for satellite networking

100 mbits/s down 5 mbit up

fiber connnectivity is common in what type of area networks

wan

what does broad band mean

transmission across mutlipel frequencies

different traffic types

wans span what

span the globe or long distances

point to point serial

wan tech

mpls

multiprotocol label switching

wan technologie

man

between lan and wan

advantages of lcd

-lightweight

-relatively low power

• relatively inexpensive

disadvantages of lcd

black levels are a challenge

requires seperate backlight

lights can be difficult to replace

what is the original lcd technology

tn

advantages and disadvantages of lcd

fast response times

poor viewing angles

ips advantages and disadvantages

excellent color representation

more expensive

va advantages and disadvantages

compromise between tn and ips

good color representation

often slower response times than tn