Ports

Question 1

Ports 20 & 21

Answer 1

FTP - file transfer protocol - not secure

Question 2

Ports 22 - connection protocol

Answer 2

SSH - secure shell - remotely and securely configure routers and switches

S/FTP - Secure File Transfer - upload and download files securely

SCP - Secure Copy Protocol - very similar to S/FTP

Question 3

Port 23

Answer 3

Telnet - remotely configure router or switch, but not secure.

Question 4

Port 25

Answer 4

SMTP - Simple Mail transport Protocol - NOT secure - is for SENDING emails only, not receiving.

Question 5

Port 49 TCP

Answer 5

TACACS+ - Cisco Proprietary AAA protocol. Uses TCP only.

Question 6

___ is reliable

Answer 6

TCP is reliable

Question 7

Which RADIUS server is reliable?

Answer 7

TACACS+

Question 8

Port 53

Answer 8

DNS - Domain Name Service both TCP and UDP. Ties a FQDN to an IP address.

Question 9

Ports 67 & 68

Answer 9

DHCP - Dynamic Host Configuration Protocol - UDP - How a Server assigns a private IP to hosts.

Question 10

What are the steps of DHCP negotiation?

Answer 10

DORA:
Discover
Offer
Request
Acceptance

Question 11

UDP Port 69

Answer 11

TFTP - Trivial File Transfer Protocol - transfer files with out reliability. Store config files for routers and switches.

Question 12

Port 80

Answer 12

HTTP - HyperText Transfer Protocol - WWW - Internet - NOT Secure

Question 13

Port 88

Answer 13

KERBEROS - Remote access server - if you see anything on the exam about Tickets or time sensitive, its KERBEROS. Ticket granting service, ticket granting server. Time sensitive. Mutual authentication mean KERBEROS too. both TCP and UDP. now owned by Microsoft. KERBEROS does Single Sign On.

Question 14

Port 110

Answer 14

POP3 - Post Office Protocol - For Receiving emails - NOT secure

Question 15

Port 123

Answer 15

NTP - Network Time Protocol - set all the clocks on devices on your network using a single server. UDP

Question 16

Port 143

Answer 16

IMAP - Receiving emails - does not download them to your device. Leaves them on the server so they are accessible everywhere.

Question 17

Ports 137/138/139

Answer 17

NETBIOS - Network based HOSTS file/DNS like service - ties hostname to IP address. Legacy tech

Question 18

Port 161/162

Answer 18

SNMP - Simple Network Management Protocol - Monitors the health of your network. V3 only (V1 & 2 were not secure)

Question 19

Port 389

Answer 19

LDAP - Unsecure version of LDAP - Lightweight Directory Access Protocol. Ties into Active Directory

Question 20

Port 443

Answer 20

HTTPS - HyperText Transport Protocol Secure - Uses SSL or TLS or both to secure HTTP traffic.

Question 21

Port 445

Answer 21

SMB - Server Message Block - messaging service through your computer.

Question 22

Port 465

Answer 22

SMTPS - Simple Mail Transport Protocol Secure - Uses SSL or TLS or both.

Question 23

Port 500

Answer 23

IPSEC -
IKE -
ISAKMP -

Question 24

Port 631

Answer 24

• **CUPS - Common Unix Printing Service - Allows printing over the internet.
• **also called IPP - internet printing protocol.

Question 25

Port 636

Answer 25

LDAP secure -

Question 26

Port 989/990

Answer 26

FTPS - File Transfer Protocol Secure - SSL or TLS or both.

Question 27

Port 995

Answer 27

POP3S

Question 28

Port 1812

Answer 28

RADIUS - Remote Access Dial-in User Service

Question 29

Port 1812

Answer 29

RADIUS - Remote Access Dial-in User Service, Open-Source. UDP, Unreliable. Authentication and Authorized, but NOT Accounting.

Question 30

Port 1813

Answer 30

RADIUS Accounting

Question 31

Port 3389

Answer 31

RDP - Remote Desktop Protocol - Microsoft only
RDP is SECURE
(Uses SSH if Linux instead of RDP)