Comptia A+ 220-1201 Core 1 Study Guide Q&A rated A., Exams of Computer Security

Comptia A+ 220-1201 Core 1 Study Guide Q&A rated A.

Typology: Exams

2025/2026

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Comptia A+ 220-1201 Core 1 Study
Guide Q&A rated A
2.1 A series of moving vans -
correct answer
✅• Efficiently move
large amounts of data
- Use a shipping truck
• The network topology is the road
- Ethernet, DSL, cable system
• The truck is the Internet Protocol (IP)
- We've designed the roads for this truck
• The boxes hold your data
- Boxes of TCP and UDP
• Inside the boxes are more things
- Application information
2.1 TCP and UDP -
correct answer
✅• Transported inside of IP
- Encapsulated by the IP protocol
• Two ways to move data from place to place
- Different features for different applications
• OSI Layer 4
- The transport layer
• Multiplexing
- Use many different applications at the same time
- TCP and UDP
2.1 TCP - Transmission Control Protocol Communication -
correct
answer
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Download Comptia A+ 220-1201 Core 1 Study Guide Q&A rated A. and more Exams Computer Security in PDF only on Docsity!

Guide Q&A rated A

2.1 A series of moving vans - correct answer ✅• Efficiently move large amounts of data

  • Use a shipping truck
  • The network topology is the road
  • Ethernet, DSL, cable system
  • The truck is the Internet Protocol (IP)
  • We've designed the roads for this truck
  • The boxes hold your data
  • Boxes of TCP and UDP
  • Inside the boxes are more things
  • Application information 2.1 TCP and UDP - correct answer ✅• Transported inside of IP
  • Encapsulated by the IP protocol
  • Two ways to move data from place to place
  • Different features for different applications
  • OSI Layer 4
  • The transport layer
  • Multiplexing
  • Use many different applications at the same time
  • TCP and UDP 2.1 TCP - Transmission Control Protocol Communication - correct answer

Guide Q&A rated A

2.1 TCP - Transmission Control Protocol - correct answer ✅• Connection-oriented

  • A formal connection setup and close
  • "Reliable" delivery
  • Recovery from errors
  • Manages out-of-order messages or retransmissions
  • Flow control
  • The receiver can manage how much data is sent 2.1 UDP - User Datagram Protocol Communication - correct answer ✅ 2.1 UDP - User Datagram Protocol - correct answer ✅• Connectionless - No formal open/close to the connection
  • "Unreliable" delivery
  • No error recovery, no reordering of data or retransmissions
  • No flow control
  • Sender determines the amount of data transmitted 2.1 Why would you ever use UDP? - correct answer ✅• Real-time communication
  • There's no way to stop and resend the data
  • Time doesn't stop for your network
  • Connectionless protocols

Guide Q&A rated A

2.1 Lots of ports - correct answer ✅• IPv4 sockets

  • Server IP address, protocol, server application port #
  • Client IP address, protocol, client port number
  • Non-ephemeral ports - permanent port numbers
  • Ports 0 through 1,023 - Usually on a server or service
  • Ephemeral ports - temporary port numbers
  • Ports 1,024 through 65,
  • Determined in real-time by the client 2.1 Port number (how many) - correct answer ✅• TCP and UDP ports can be any number between 0 and 65,
  • Most servers (services) use non-ephemeral (not-temporary) port numbers
  • This isn't always the case - it's just a number.
  • Port numbers are for communication, not security
  • Service port numbers need to be "well known"
  • TCP port numbers aren't the same as UDP port numbers 2.1 Port numbers - correct answer ✅• Well-known port number
  • Client and server need to match
  • Important for firewall rules
  • Port-based security
  • A bit of rote memorization

Guide Q&A rated A

  • Becomes second nature after a while
  • Make sure you know port number, protocol, and how the protocol is used 2.1 FTP - File Transfer Protocol - correct answer ✅• tcp/20 (active mode data), tcp/21 (control)
  • Transfers files between systems
  • Authenticates with a username and password
  • Some systems use a generic/anonymous login
  • Full-featured functionality - List, add, delete, etc. 2.1 SSH - Secure Shell - correct answer ✅• Encrypted communication link - tcp/
  • Looks and acts the same as Telnet 2.1 Telnet - correct answer ✅• Telnet - Telecommunication Network - tcp/
  • Login to devices remotely
  • Console access
  • In-the-clear communication
  • Not the best choice for production systems 2.1 SMTP - Simple Mail Transfer Protocol - correct answer ✅• SMTP - Simple Mail Transfer Protocol
  • Server to server email transfer

Guide Q&A rated A

  • Addresses are assigned by MAC address in the DHCP server
  • Manage addresses from one location 2.1 HTTP and HTTPS - correct answer ✅• Hypertext Transfer Protocol
  • Communication in the browser
  • And by other applications
  • In the clear or encrypted
  • Supported by nearly all web servers and clients 2.1 POP3 / IMAP - correct answer ✅• Receive emails from an email server
  • Authenticate and transfer
  • POP3 - Post office Protocol version 3
  • tcp/
  • Basic mail transfer functionality
  • IMAP4 - Internet Message Access Protocol v
  • tcp/
  • Includes email inbox management from multiple clients
  • SMB - Server Message Block
  • Protocol used by Microsoft Windows
  • File sharing, printer sharing
  • Also called CIFS (Common Internet File System)

Guide Q&A rated A

  • Using NetBIOS over TCP/IP (Network Basic Input/Output System)
  • udp/137 - NetBIOS name services (nbname)
  • tcp/139 - NetBIOS session service (nbsession)
  • Direct over tcp/445 (NetBIOS-less)
  • Direct SMB communication over TCP without the NetBIOS transport 2.1 LDAP/LADPS - correct answer ✅• LDAP (Lightweight Directory Access Protocol)
  • tcp/
  • Store and retrieve information in a network directory
  • Commonly used in Microsoft Active Directory 2.1 RDP - Remote Desktop Protocol - correct answer ✅• Share a desktop from a remote location over tcp/
  • Remote Desktop Services on many Windows versions
  • Can connect to an entire desktop or just an application
  • Clients for Windows, macOS, Linux, Unix, iPhone, Android, and others 2.1 Common Ports - correct answer ✅ 2.2 Wireless technologies - correct answer ✅• IEEE standards

Guide Q&A rated A

  • Same as 802.
  • Short-range
  • Most consumer devices operate to about 10 meters 2.2 RFID (Radio-frequency identification) - correct answer ✅• It's everywhere
  • Access badges
  • Inventory/Assembly line tracking
  • Pet/Animal identification
  • Anything that needs to be tracked
  • Radar technology
  • Radio energy transmitted to the tag
  • RF powers the tag, ID is transmitted back
  • Bidirectional communication
  • Some tag formats can be active/powered 2.2 NFC (Near field communication) - correct answer ✅• Two- way wireless communication
  • Builds on RFID, which is mostly one-way
  • Payment systems - Major credit cards, online wallets
  • Bootstrap for other wireless
  • NFC helps with Bluetooth pairing
  • Access token, identity "card"
  • Short range with encryption support

Guide Q&A rated A

2.2 Wireless Network Technologies - correct answer ✅ 2.3 DNS server - correct answer ✅• Domain Name System

  • Convert names to IP addresses
  • And vice versa
  • Distributed naming system
  • The load is balanced across many different servers
  • Usually managed by the ISP or IT department
  • A critical resource 2.3 DHCP server - correct answer ✅• Dynamic Host Configuration Protocol
  • Automatic IP address configuration
  • Very common service
  • Available on most home routers
  • Enterprise DHCP will be redundant
  • Usually running on central servers 2.3 File share - correct answer ✅• Centralized storage of documents,spreadsheets, videos, pictures, and any other files
  • A fileshare
  • Standard system of file management

Guide Q&A rated A

  • Diverse systems, consolidated log
  • Usually a central logging receiver
  • Integrated into the SIEM
  • You're going to need a lot of disk space
  • No, more. More than that. 2.3 Web server - correct answer ✅• Respond to browser requests
  • Using standard web browsing protocols - HTTP/HTTPS
  • Pages are built with HTML, HTML
  • Web pages are stored on the server
  • Downloaded to the browser
  • Static pages or built dynamically in real-time 2.3 Authentication server - correct answer ✅• Login authentication to resources
  • Centralized management
  • Almost always an enterprise service
  • Not required on a home network
  • Usually a set of redundant servers
  • Always available
  • Extremely important service 2.3 Database servers - correct answer ✅• Database table storage

Guide Q&A rated A

  • Save information in columns and rows
  • Similar to a spreadsheet
  • Relational database
  • Link tables together
  • These links are relationships
  • Flexible and fast
  • Structured Query Language (SQL)
  • Access data using a standard language
  • Microsoft SQL Server, MySQL, etc. 2.3 NTP servers - correct answer ✅• The time of day is more important than you might think
  • Encryption, logins, backups, log timestamps
  • Everything needs to work from the same clock
  • NTP server
  • Listens on udp/
  • Responds to time requests from NTP clients
  • NTP client
  • Requests time updates from NTP server
  • Daily synchronization is common 2.3 Spam gateways - correct answer ✅• Unsolicited messages
  • Email, forums, etc.
  • Various content

Guide Q&A rated A

  • Multiple servers - Invisible to the end-user
  • Large-scale implementations
  • Web server farms, database farms
  • Fault tolerance
  • Server outages have no effect - Very fast convergence 2.3 Proxy server - correct answer ✅• An intermediate server
  • Client makes the request to the proxy
  • The proxy performs the actual request
  • The proxy provides results back to the client
  • Useful features
  • Access control, caching, URL filtering, content scanning 2.3 SCADA / ICS - correct answer ✅• Supervisory Control and Data Acquisition System
  • Large-scale, multi-site Industrial Control Systems (ICS)
  • PC manages equipment
  • Power generation, refining, manufacturing equipment
  • Facilities, industrial, energy, logistics
  • Distributed control systems
  • Real-time information
  • System control
  • Requires extensive segmentation

Guide Q&A rated A

  • No access from the outside 2.3 Legacy and embedded systems - correct answer ✅• Legacy systems
  • Another expression for "really old"
  • May also be "really important"
  • Learning old things can be just as important as learning the new things
  • Embedded systems
  • Purpose-built device
  • Not usual to have direct access to the operating system
  • Alarm system, door security, time card system 2.3 IoT (Internet of Things) devices - correct answer ✅• Appliances
  • Refrigerators
  • Smart devices
  • Smart speakers respond to voice
  • Air control
  • Thermostats, temperature control
  • Access
  • Smart doorbells
  • May require a segmented network

Guide Q&A rated A

  • IP addresses, certificates, host alias names, etc.
  • These are important and critical configurations
  • Make sure to check your settings, backup, and test! 2.4 Address records (A) (AAAA) - correct answer ✅• Defines the IP address of a host
  • This is the most popular query
  • A records are for IPv4 addresses
  • Modify the A record to change the host name to IP address resolution
  • AAAA records are for IPv6 addresses
  • The same DNS server, different records 2.4 Canonical name records (CNAME) - correct answer ✅• A name is an alias of another, canonical name
  • One physical server, multiple services 2.4 Mail exchanger record (MX) - correct answer ✅• Determines the host name for the mail server - this isn't an IP address; it's a name 2.4 Text records (TXT) - correct answer ✅• Human-readable text information
  • Useful public information
  • Was originally designed for

Guide Q&A rated A

informal information

  • Can be used for verification purposes
  • If you have access to the DNS, then you must be the administrator of the domain name
  • Commonly used for email security
  • External email servers validate information from your DNS 2.4 Domain Keys Identified Mail (DKIM) - correct answer ✅• Digitally sign a domain's outgoing mail
  • Validated by mail servers, not usually seen by the end user
  • The public key is in the DKIM TXT record 2.4 Sender Policy Framework (SPF) - correct answer ✅• SPF protocol
  • A list of all servers authorized to send emails for this domain
  • Prevent mail spoofing
  • Mail servers perform a check to see if incoming mail really did come from an authorized host 2.4 DMARC - correct answer ✅• Domain-based Message Authentication, Reporting,