Download CompTIA Network+ Exam: Key Network Ports and Protocols and more Exercises Computer Networks in PDF only on Docsity!
COMPTIA NETWORK - EXAM QUESTIONS AND
VERIFIED ANSWERS 2025 /2026 EDITION
(GRADED A+) DETAILED ANSWERS!!
65,536 - โ
โ
How many network ports are available for use? SSH, SCP, SFTP - โ
โ
What operates on port 22 TCP/UDP? FTP - โ
โ
20/21 TCP; File Transfer Protocol is used to transfer files from host to host usually in cleartext over port 20 or 21 SSH - โ
โ
Secure Shell encrypts traffic over TCP port 22; it is used to remotely administer network devices and systems; OR secure remote control of another machine using a text based environment SCP - โ
โ
Secure copy; based on SSH and is used to copy encrypted files over a network SFTP - โ
โ
Secure File Transfer Protocol uses Secure Shell (SSH) to encrypt traffic over port 22; secure implementation of FTP Telnet - โ
โ
23 TCP/UDP; Unencrypted method to remotely administer network devices (Should not be used, people use SSH now instead); OR an insecure remote access command prompt method over port 23 SMTP - โ
โ
25 TCP; Simple Mail Transfer Protocol is used to send email over the Internet on port 25 DNS - โ
โ
53 TCP/UDP; Domain Name Service is used to resolve hostnames to IPs and IPs to hostnames on port 53
TFTP - โ
โ
69 UDP; Trivial File Transfer Protocol is used as simplified version of FTP to transfer smaller amounts of data; put a file on a remote host, or get a file from a remote host; typically disabled HTTP - โ
โ
80 TCP; Hyper Text Transfer Protocol is used to transmit web page data to a client for unsecured web browsing Kerberos - โ
โ
88 TCP/UDP; Used for network authentication using a system of timestamped tickets distributed by a Key Distribution Center within a Windows domain POP3 - โ
โ
110 TCP; Post Office Protocol v3 transfers email from servers down to clients using an unencrypted connection; "downloads emails" so you can read them offline; receiving emails is POP3 and IMAP NNTP - โ
โ
119 TCP; Network News Transfer Protocol is used to transport Usenet articles RPC/DCOM-scm - โ
โ
135 TCP/UDP; Remote Procedure Call is used to locate DCOM ports request a service from a program on another computer on the network NetBIOS - โ
โ
137 - 139 TCP/UDP; Network Basic Input/Output System, (NetBIOS) Provides services allowing applications on separate computers to communicate over a local area network for file and printer sharing; OR is used to conduct name querying, sending of data, and other functions over a NetBIOS connection. related to SMB (Server Message Block); NetBIOS is focused on authentication where SMB is focused on passing those files to you. IMAP - โ
โ
143 TCP; Internet Message Access Protocol is used to store email on an email server, and it allows users to organize and manage email in folders on the server using an unencrypted connection; receiving emails uses IMAP and POP
connection; OR used to query and maintain directories of users and other objects over a encrypted SSL/TLS connection iSCSI - โ
โ
860 TCP; iSCSI is used for linking data storage facilities over IP FTPS - โ
โ
989/990 TCP; File Transfer Protocol Secure; an extension of FTP and uses TLS to encrypt FTP traffic; is used to transfer files from host to host over an encrypted connection; uses TLS to encrypt traffic IMAP4 with SSL/TLS - โ
โ
993 TCP; Internet Message Access Protocol version 4 is used to manage email folders on a mail server over an SSL/TLS encrypted connection POP3 (SSL/TLS) - โ
โ
995 TCP; Post Office Protocol v3 is used to receive email from a mail server using an SSL/TLS-encrypted connection Ms-sql-s - โ
โ
1433 TCP; Microsoft SQL server is used to receive SQL database queries from clients RADIUS (alternative) - โ
โ
1645/1646 UDP; Remote Authentication Dial-In User Service is used for authentication and authorization (1645) and accounting (1646) FCIP - โ
โ
3225 TCP/UDP; Fibre Channel IP is used to encapsulate Fibre Channel frames within TCP/IP packets iSCSI Target - โ
โ
3260 TCP; iSCSI Target is as the listening port for iSCSI-targeted devices when linking data storage facilities over IP RDP - โ
โ
3389 TCP/UDP; Remote Desktop Protocol is used to remotely view and control other windows systems via a Graphical User Interface over port 3389
Diameter - โ
โ
3868 TCP; A more advanced AAA protocol that is a replacement for RADIUS Syslog over TLS - โ
โ
6514 TCP; It is used to conduct computer message logging, especially for routers and firewall logs, over a TLS-encrypted connection TCP - โ
โ
Transmission Control Protocol that is connection oriented (guaranteed delivery). Uses a three-way handshake; connection between client and server is established before data can be sent. UDP - โ
โ
User Datagram Protocol; Connection less communication model. Makes a best effort to deliver traffic without using extra traffic to ensure delivery. Provides checksums for data integrity, and port numbers for addressing. PPTP - โ
โ
1723 TCP/UDP; uses Microsoft's point-to-point encryption to create a secure channel. PPTP is rarely used today because of known vulnerabilities. L2TP - โ
โ
1701 UDP; Cisco's and Microsoft's created this tunnel between devices; however, it doesn't include any encryption RADIUS - โ
โ
1812/1813 UDP; centralized method of authentication for multiple remote access servers; encrypts the password packets, but not the entire authentication process IP - โ
โ
Internet Protocol; identifies a host in a TCP/IP network and delivers traffic from one host to another using IP addresses ARP - โ
โ
Address Resolution Protocol; resolves IPv4 addresses to media access control (MAC) addresses. TLS - โ
โ
Transport Layer Security; a replacement for SSL and is used to encrypt many different protocols, including browser-based connections using HTTPS.
Web application firewall - โ
โ
A firewall specifically designed to protect a web application which is commonly hosted on a web server. Next-Generation Firewall (NGFW) - โ
โ
An advanced firewall that can perform deep-packet inspection, adding application-level inspection as a core feature TCP, UDP, IP, ICMP, ARP - โ
โ
TCP/IP isn't a single protocol but instead, a full suite of protocols. Name some basic networking protocols. RTP, SRTP, SIP - โ
โ
Name some protocols best suited for voice and video streaming. DHCP - โ
โ
Port 67, 68; Dynamic Host Control Protocol (DHCP), automatically assigns IP addresses and network configurations on port 67 and 68 NTP - โ
โ
Port 123; Network Time Protocol; provides clock synchronization between computer systems over networks
