Drag and Drop Matching Questions

Physical Layer: Transmits raw bits over a physical medium.

The Physical layer is correctly described as transmitting raw bits over a physical medium. This foundational layer is responsible for the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between devices. It defines how data bits are converted into signals (e.g., electrical pulses, light pulses, radio waves) and transmitted across cables, fiber optics, or wireless channels, ensuring the raw binary data reaches its destination.

Network Layer: Routes packets using logical addressing.

The Network layer is accurately described as routing packets using logical addressing. This crucial layer is responsible for determining the best path for data packets to travel across different networks, utilizing logical addresses like IP addresses for identification. It handles the forwarding of packets from source to destination, enabling inter-network communication and ensuring data reaches the correct subnet or host, even across complex network topologies.

Application Layer: Provides network services to end-user applications.

The Application layer is correctly described as providing network services to end-user applications. This top layer of the OSI model serves as the interface between the user's software applications and the underlying network services. It enables applications such as web browsers, email clients, and file transfer programs to access network resources and communicate with remote hosts, facilitating user interaction with network functionalities.

DHCP: Automatically assigns IP addresses to devices on a network.

DHCP (Dynamic Host Configuration Protocol) is a crucial network service that automates the assignment of IP addresses, subnet masks, default gateways, and DNS server information to client devices. This eliminates the need for manual configuration, significantly simplifying network administration and reducing potential errors. It ensures that every device receives a unique, valid IP address, allowing it to communicate effectively on the network.

DNS: Resolves domain names to IP addresses.

DNS (Domain Name System) is the internet's phonebook, translating human-friendly domain names, such as www.example.com, into machine-readable IP addresses like 192.0.2.1. This hierarchical and distributed naming system is fundamental for web browsing and email, enabling users to access resources without needing to memorize complex numerical addresses. Without DNS, navigating the internet would be impractical, as every connection would require direct IP address knowledge.

HTTP: Protocol used for web traffic.

HTTP (Hypertext Transfer Protocol) is the foundational protocol for data communication on the World Wide Web, enabling clients (web browsers) to request and receive resources from web servers. It operates on a client-server model, primarily used for transmitting HTML documents, images, videos, and other web content. While stateless, subsequent versions and related protocols like HTTPS enhance its capabilities for secure and dynamic web experiences.

SMTP: Protocol for sending email.

SMTP (Simple Mail Transfer Protocol) is specifically designed for sending email messages between mail servers and from a client's email application to an outgoing mail server. It handles the transmission of emails across the internet, ensuring they reach their intended destination server. While SMTP facilitates the sending process, separate protocols like POP3 or IMAP are used by clients to retrieve incoming emails from their mailboxes.

HTTP: 80

Hypertext Transfer Protocol (HTTP) is the foundational protocol for data communication on the World Wide Web. It operates by default on TCP port 80, enabling web browsers to request and receive web pages and other resources from web servers. This port facilitates unencrypted communication, making it a well-known standard for basic web traffic.

HTTPS: 443

Hypertext Transfer Protocol Secure (HTTPS) is the secure version of HTTP, utilizing Transport Layer Security (TLS) or its predecessor, Secure Sockets Layer (SSL), to encrypt communication. It exclusively uses TCP port 443 to establish secure connections between a client and a server, protecting data integrity and confidentiality during web transactions. This ensures sensitive information, like login credentials or payment details, remains private.

FTP: 21

File Transfer Protocol (FTP) is a standard network protocol used for transferring computer files between a client and server on a computer network. Specifically, TCP port 21 is designated as the control port for FTP, handling commands, authentication, and session management. While data transfer typically occurs over a separate port (often 20 or a dynamic port), port 21 is crucial for initiating and managing the file transfer process.

SSH: 22

Secure Shell (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network. It uses TCP port 22 by default to establish a secure, encrypted connection, enabling remote command-line login, remote command execution, and secure file transfers (SFTP). SSH provides strong authentication and data encryption, making it a preferred method for secure remote administration.

Cat5e: 100 meters

Category 5e (Cat5e) unshielded twisted-pair (UTP) cabling is a widely adopted standard for Ethernet networks. It reliably supports data rates up to 1 Gigabit Ethernet (1000BASE-T) over a maximum segment length of 100 meters (328 feet). This distance limitation is crucial for maintaining signal integrity and minimizing attenuation and crosstalk within the specified performance parameters, ensuring stable network operation.

10BASE2: 185 meters

10BASE2, also known as "ThinNet," utilizes RG-58 coaxial cable and was an early Ethernet standard operating at 10 Mbps. Its maximum segment length is precisely 185 meters (607 feet), significantly longer than twisted-pair copper for its time. This standard allowed for easier installation and daisy-chaining of devices compared to its thicker counterpart, 10BASE5, before UTP became dominant.

Multimode fiber: 550 meters

Multimode fiber optic cable, particularly for standards like 1000BASE-SX (Gigabit Ethernet over short wavelength), typically has a maximum segment length of 550 meters (1,804 feet). This limitation arises because the multiple light paths within the fiber cause modal dispersion, which degrades the signal over longer distances and higher speeds, making it unsuitable for very long-haul transmissions.

Router: Connects multiple networks and routes data packets between them.

Routers operate at Layer 3 and use IP addresses to forward packets between different networks.

Switch: Connects devices within a single network and forwards data based on MAC addresses.

Switches operate at Layer 2 and use MAC addresses to efficiently direct frames to specific devices.

Firewall: Monitors and controls incoming/outgoing network traffic based on security rules.

Firewalls enforce security policies by permitting or denying traffic based on rules.

Access Point: Allows wireless devices to connect to a wired network.

Access points bridge wireless clients to a wired LAN, often using Wi-Fi.

Distributed Denial-of-Service (DDoS): Overwhelms a network or server with a flood of traffic from multiple sources

A Distributed Denial-of-Service (DDoS) attack aims to make a network service or resource unavailable to its legitimate users by overwhelming it with a massive flood of malicious traffic. This traffic originates from numerous compromised systems, often forming a botnet, which collectively saturate the target's bandwidth or exhaust its processing capabilities. The sheer volume of requests prevents the target system from responding to legitimate requests, leading to service disruption.

Man-in-the-Middle (MitM): Intercepts and potentially alters communication between two parties without their knowledge

A Man-in-the-Middle (MitM) attack positions the attacker covertly between two communicating parties, allowing them to intercept, read, and potentially modify the data exchanged between them. The legitimate parties remain unaware that their communication is being compromised, believing they are communicating directly. This type of attack often leverages techniques like ARP spoofing or DNS spoofing to redirect traffic through the attacker's system, compromising both confidentiality and integrity.

Phishing: Sends fraudulent emails or messages tricking users into revealing sensitive information

Phishing is a social engineering attack where an attacker sends deceptive communications, typically emails or text messages, impersonating a trustworthy entity to trick individuals. The objective is to manipulate recipients into divulging sensitive personal information, such as login credentials, financial details, or other confidential data. These fraudulent messages often contain malicious links or attachments designed to compromise the user's system or steal information directly.

Ransomware: Malware that encrypts files and demands payment for decryption

Ransomware is a malicious software program that, once executed on a system, encrypts the user's files or locks down the entire operating system, rendering data inaccessible. The attacker then demands a monetary payment, typically in cryptocurrency, in exchange for a decryption key or tool to restore access to the compromised data. This attack directly impacts data availability and can cause significant operational disruption for individuals and organizations.

802.11b: Maximum speed of 11 Mbps

The 802.11b standard, ratified in 1999, was the first widely adopted Wi-Fi protocol. Operating exclusively in the 2.4 GHz frequency band, it utilized Direct Sequence Spread Spectrum (DSSS) modulation to achieve a maximum theoretical data rate of 11 Mbps. While slow by modern standards, it laid the groundwork for widespread wireless networking.

802.11g: Maximum speed of 54 Mbps

Introduced in 2003, 802.11g significantly improved upon its predecessor by boosting the maximum theoretical speed to 54 Mbps. It also operates in the 2.4 GHz band, making it backward compatible with 802.11b devices. This standard achieved higher speeds by adopting Orthogonal Frequency-Division Multiplexing (OFDM) modulation, similar to 802.11a.

802.11ac: Maximum speed of 1.3 Gbps

The 802.11ac standard, also known as Wi-Fi 5, delivers a substantial increase in throughput, reaching maximum theoretical speeds of up to 1.3 Gbps for a single link. It operates exclusively in the less congested 5 GHz frequency band, leveraging technologies like wider channels (up to 160 MHz) and multi-user MIMO (MU-MIMO) to achieve these gigabit speeds. This standard was designed for high-density environments and demanding applications.