What is the main job of a network firewall?
AnswerFiltering network traffic based on rules
A firewall allows or blocks traffic according to a set of security rules.
Tech · Facts & stats
Firewall facts & stats
7 fact-checked facts about firewalls and network security basics, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
The computing term firewall was borrowed from what?
AnswerA wall built to stop fire spreading in buildings
Like a building firewall, a network firewall contains threats to one side.
Going deeper
What is the default port for SSH?
Answer22
SSH listens on port 22; Telnet uses 23 and SMTP uses 25.
A firewall that tracks the state of active connections is called what?
AnswerStateful
Stateful firewalls remember connections and allow matching return traffic.
In networking, what is a DMZ?
AnswerA buffer network between the internet and an internal network
A DMZ hosts public-facing servers while keeping the internal network separate.
Expert level
A web application firewall mainly inspects traffic at which OSI layer?
AnswerLayer 7, application
WAFs read HTTP requests at the application layer to block attacks like SQL injection.
What does NAT stand for in networking?
AnswerNetwork Address Translation
NAT maps private internal addresses to a public address.
Know these cold?Today's round is five questions like these, 20 seconds each. Your streak and level follow you to every arena.Play today's round