The CyberGuard field guide / Topics

Network Security.

Make sense of the protocols, addresses, and controls behind connected systems.

22 published definitionsPractical examples and source links
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THE DEFINITIONS

Explore Network Security.

Open a term for a plain-language explanation, a technical explanation, and a practical example.

DEFINITION 01

BGP Routing

Border Gateway Protocol is the routing protocol used by autonomous systems to exchange reachability information across the Internet.

DEFINITION 02

Carrier Grade NAT

Carrier-grade NAT is address and port translation operated by an internet provider so multiple customers can share public IPv4 addresses.

DEFINITION 03

DNS Spoofing

Manipulation of DNS information so a name resolves to an unintended destination.

DEFINITION 04

Denial of Service

An event or attack that prevents legitimate users from accessing a service.

DEFINITION 05

Domain Name System

A distributed system that translates domain names into DNS records such as IP addresses.

DEFINITION 06

Dynamic Host Configuration Protocol

Dynamic Host Configuration Protocol automatically supplies network settings such as an IP address, subnet information, gateway, and DNS servers to a device.

DEFINITION 07

Firewall

A device or program that controls network traffic according to security rules.

DEFINITION 08

IP Address

A numeric address used to identify a network interface in Internet Protocol communication.

DEFINITION 09

IPv6

The 128-bit version of Internet Protocol addressing and packet delivery.

DEFINITION 10

Intrusion Prevention System

An intrusion prevention system monitors activity for signs of attack and can automatically block or interrupt traffic that matches its detection logic.

DEFINITION 11

Network Access Control

Network access control checks whether a device or user is allowed to join a network and may assign access based on identity or device state.

DEFINITION 12

Network Address Translation

Network address translation changes IP address information as packets cross a network boundary, often letting multiple private devices share public connectivity.

DEFINITION 13

Network Segmentation

Dividing a network into zones with controlled communication between them.

DEFINITION 14

Packet Inspection

Packet inspection is the examination of network packet headers, metadata, or payloads to classify traffic and apply monitoring or security policy.

DEFINITION 15

Private IP

A private IP address is an address from a range reserved for use within private networks rather than routing directly on the public Internet.

DEFINITION 16

Proxy Server

A proxy server is an intermediary selected by a client to make requests to another service on the client's behalf.

DEFINITION 17

Public IP

A public IP address is an Internet address intended for globally reachable routing, subject to network policy and address allocation.

DEFINITION 18

Reverse Proxy

A reverse proxy is an intermediary that receives client requests as the public-facing endpoint and forwards them to one or more backend services.

DEFINITION 19

Transmission Control Protocol

Transmission Control Protocol is a connection-oriented transport protocol that provides an ordered, reliable byte stream between applications.

DEFINITION 20

User Datagram Protocol

User Datagram Protocol is a lightweight transport protocol that sends datagrams between application ports without guaranteeing delivery or ordering.

DEFINITION 21

Virtual Local Area Network

A virtual local area network is a logical grouping of network ports and traffic within a bridged network, independent of physical cabling.

DEFINITION 22

Virtual Private Network

Technology that creates an encrypted network tunnel between endpoints over another network.

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