Download CompTIA Network+ Exam Q&A: Network Protocols and Security and more Exercises Computer Networks in PDF only on Docsity!
COMPTIA NETWORK - EXAM QUESTIONS AND
VERIFIED ANSWERS 2025 /2026 EDITION
(GRADED A+) DETAILED ANSWERS!!
Used to prevent Data loops between switches operating at layer 2 of the OSI Also prevents Bridge loops - ✅✅STP (Spanning Tree Protocol) Wide Area Network (WAN) technology that supports 1.544 Mbps - ✅✅T1 line DNS Record type used for IPv6 address resolution - ✅✅AAAA LC Connector - ✅✅Small Form Factor of SC connector Used to locate a break in coaxial cable as quickly as possible - ✅✅Time Domain Reflectometer (TDR) OSI layer that VLANs operate - ✅✅OSI Layer 2 How to mitigate a Smurf Attack - ✅✅Block ICMP requests Performance Statistics captured to be compared to future statistics. Used for tuning, optimizations and troubleshooting - ✅✅Baseline Analysis Record organizational assets including personnel and other non-computer resources. - ✅✅Asset Management
Topology where every host device is directly connected to every other through a common cable. - ✅✅BUS Layer 3 device that connects different subnets - ✅✅Router Diagram detailing
- IP Addresses
- Static vs. Dynamic
- Physical Locations,
- Cabling type,
- protocol, and - speed of connections - ✅✅Physical Network Diagram Exchange routing information with autonomous networks - ✅✅Interior Gateway Protocol (IGP) Packet Switching Technology
- Breaks data into packets for transmission
- Assign label for routing
- Packets routed individually Internet and Ethernet networks use Packet Switching - ✅✅MPLS Multiplexing protocol use to transmit data of optical cabling - ✅✅SDH wireless broadband standard that uses multiple antennas
The network is in a steady state - ✅✅Convergence of Network Routers 802.11g 802.11n Supports ---- ---- - ✅✅Channel Bonding Network Interface layer TCP/IP (Link Layer) - ✅✅OSI layers 1 Physical and 2 Data Link, lowest level of the TCP/IP suite. This layer is responsible for placing and removing packets on the physical network through communication with the network adapters in the host Internet Layer of the TCP/IP refers to what OSI layer - ✅✅OSI layer
- Network Transport Layer TCP/IP - ✅✅OSI layer
- Transport, layer is responsible for the mechanisms focused on reliability of the data. Application Layer TCP/IP - ✅✅OSI Layers
- Session
- Presentation
- Application
In the TCP/IP model, the application layer contains the logic needed to support the various user applications. SNMP (Simple Network Management Protocol) monitors port ---for requests - ✅✅UDP port 161 Provides
- NAT (network address translation)
- Web page caching
- Security Reduces traffic because pages are delivered from the cache. - ✅✅Proxy Server Prioritizes Traffic and controls transmission rates by port usage, or protocol and Can delay packets to control bandwidth (Throttling) - ✅✅Bandwidth Shaper A network device that helps evenly distribute the flow of network traffic to other hosts. - ✅✅Load Balancer A Layer 3 switch that provides routing. In Local Area Network(LAN), not on perimeter. - ✅✅Multi Layer Switch Tool used to connect twisted pair cable to a 110 block - ✅✅Punch Down Tool Distance vector routing protocol supported by the widest variety of routers
Server Roles - ✅✅Logical Network Diagram Documentation showing Physical locations of equipment Infrastructure Cable Types and lengths - ✅✅Physical Network Diagram Documentation showing how devices and software are configured - ✅✅Configuration Documentation TCP/IP protocol that allows you to securely monitor network attached devices. (Authentication, Encryption and message integrity) Network management console that:
- Provides Information about network devices
- Controls Network Devices Port 161 - ✅✅SNMPv Email Protocol used to communicate with email server by port 143 - ✅✅IMAP (Internet Message Access Protocol) Protocol used for sending Error and Control messages (i.e. Ping messages) - ✅✅ICMP (Internet Control Message Protocol) Traffic gets routed between switches or bridges and without reaching destination - ✅✅Switch or Bridge loops Link-State Routing protocol Uses route with lowest cost.
Considers Bandwidth and distance - ✅✅OSPF (Open Shortest Path First) Term for: Network is in a steady state and All routers contain correct route information - ✅✅Convergence Port for
- SSH (Secure Shell) to Run commands for remote computers in a secure environment
- SFTP (Secure File Transfer Protocol)
- SCP (Secure Copy) - ✅✅Port 22 HTTPS port Secure communications between browser and web servers - ✅✅Port 443 Port used for Telnet Secured by TLS or SSL - ✅✅Pot 992 Unsecure Telnet Port allows connections and command line access to remote computers in clear text. - ✅✅Port 23 Port for listening for SNMP requests. (Simple Network Management Protocol) - ✅✅UDP port 161 Port for SNMP notifications (TRAPS) - ✅✅UDP port 162 Process of using 2 channels used instead of 1 to increase bandwidth and double data rate. - ✅✅Channel bonding
Fiber optic line that uses SONET 51.84 Mbps - ✅✅OC-1 (Optical Carrier) Wide Area Network (WAN) technology that supports 1.544 Mbps 23 Channels (No control channel) 64 Kbps per channel - ✅✅ISDN-PRI Wide Area Network (WAN) technology that supports 128 Kbps 2 Channels (No control channel) 64 Kbps per channel - ✅✅ISDN-BRI Port for DNS Server Resolve Host to IP addresses - ✅✅Port 53 Port used for DHCP to assign IP addresses and BOOTP to support diskless workstations - ✅✅UDP port 67 Port used for NetBIOS name resolution - ✅✅TCP port 137 What is the main function of a proxy server - ✅✅Protect Clients One limitation of the original server virtualization platform is--- - ✅✅All instances had to be on the same subnet.
What network device allows a server to be brought down without adversely affecting the service quality? - ✅✅Content Switch (aka Load Balancer) DNS Record type used for email server. - ✅✅MX (Mail Exchange) Points to a Canonical Name (CNAME) record and is used for reverse DNS lookup - ✅✅PTR (pointer) Reverse DNS lookup - ✅✅Determine domain name associated with an IP address Alias of an existing record, allowing multiple DNS records to match to the same IP address. - ✅✅CNAME (Canonical Name) Used to map a host name to an IPv4 address - ✅✅A Record (Address Record) Block used to terminate high speed networks - ✅✅110 block Block used to terminate telephone connections and networks up to 10 Mbps using CAT3 cabling
- ✅✅66 block What is needed on a router for a DHCP client to send a DHCP-DISCOVER message to the DHCP server? - ✅✅DHCP Relay agent Technology that allows a network provider to offer networking services to customers - ✅✅NaaS (Network as a Service) Type of cable to connect one computer directly to another - ✅✅Crossover Cable
Commonly used with MMF - ✅✅Bayonet connector Fiber connection used to connect 2 fiber strands (one transmit, one receive) in a single connector. - ✅✅MTRJ Service using a VoIP service to eliminate telephone switches. Voice is encapsulated inside data packets and transmitted across the network - ✅✅Virtual PBX Service replacing in-house voice switches. - ✅✅Hosted PBX Computing environment where the mainframe computer performs data storage and processing tasks on behalf of the clients and other network devices - ✅✅Host Physical subdivision of a network that links a number of devices or serves as a connection between 2 nodes - ✅✅Segment In which topology does a MUX separate signals to enable them to share media. - ✅✅Logical Star On which network is CSMA/CA commonly implemented - ✅✅Ethernet wireless transmission where the signal is sent over more than one frequency. - ✅✅Spread Spectrum Result of connecting a segment to multiple grounds - ✅✅Noise can be introduced
Controls data sent between 2 nodes - ✅✅Ethernet Frames Management frame used to start and maintain wireless communications. 802.11 50 bytes long - ✅✅Beacon Frames How many layers does the TCP/IP network model have? - ✅✅ 4 Service added to the IP protocol that attempts to report the condition of a connection between 2 nodes. - ✅✅ICMP Software that connects an application with a network protocol.
- a port number together with a source and destination IP address which enables communication between two applications on a network. - ✅✅Socket Name resolution service that translates FQDNs into IP addresses. - ✅✅DNS Provides information about latency and packet loss on a network. - ✅✅Ping Protocol that allows a user to access a directory structure on a remote host, Search and rename files and directories, and Download and upload files. - ✅✅FTP switching network that involves dividing data into variable-length packets - ✅✅Packet switching network AS router role representing a router that remains outside the AS - ✅✅External router
Which troubleshooting tool helps you detect devices and identify points of interference? - ✅✅Wireless Tester Port 25 The main protocol used to send electronic mail from server to server on the Internet. - ✅✅SMTP TLS can be used to mitigate what kind of attacks? - ✅✅Man in the Middle Resends Packets after a collision Wired networks only. - ✅✅CSMA/CD Used Back-Off Factor Wireless Networks - ✅✅CSMA/CA Linux commanded used to query a DNS Server to resolve a computer Name with an IP address Used to locate computers registered with Name Server (NS) records or Mail Exchangers (MX) Can also use host, or dig commands - ✅✅NSLookup (Name Support Lookup) Unix command used for looking up IP configuration of a local computer. - ✅✅IFconfig
--- allows VLAN to be configured on one --- server and distributed to all switches without having to configure each switch. Minimises Administrative effort. - ✅✅VTP (VLAN Trunk Protocol) Back Out Plan - ✅✅Processes Required to restore a system to its original or earlier state. Detailed steps and techniques for uninstalling or de-integrating a new system, as well as, reversing process changes What is likely to be overlooked, if not involved in business continuity planning? - ✅✅Single points of failure What provides fault tolerance through disk mirroring? - ✅✅Raid- 1 What should provide availability, should a hard drive fail in a server? - ✅✅Hardware RAID RAID 5 What can remove a server as a single point of failure? - ✅✅Failover Clustering What does a UPS provide? - ✅✅Fault tolerance What help ensure availability in the event of an extended power outage? - ✅✅Generators
How to validate a BCP. - ✅✅Testing What should be implemented with a fire alarm system to prevent fire spread? - ✅✅HVAC Purpose of Hot/Cold Aisles - ✅✅Regulate cooling Increase Availability Reduce Cooling Costs Fail mode for Security >Availability - ✅✅Fail Safe-Closed B
