What is an autonomous system? | What are ASNs?
An autonomous system (AS) is a very large network or group of networks with a single routing policy. Each AS is assigned a unique ASN, which is a number that…
What is a DNS CNAME record?
The DNS CNAME record works as an alias for domain names that share a single IP address. A “canonical name” (CNAME) record points from an alias domain to a “canonical”…
What is blackhole routing?
Blackhole routing is a DDoS mitigation strategy that eliminates all traffic from specific sources. What is DDoS blackhole routing? DDoS blackhole routing/filtering (sometimes called blackholing), is a countermeasure to mitigate…
What is DNS? | How DNS works
DNS lets users connect to websites using domain names instead of IP addresses. Learn more about how DNS works. What is DNS? The Domain Name System (DNS) is the phonebook…
DNS server types
Four different types of DNS servers have to work in harmony to deliver a single webpage. What are the different types of DNS servers? All DNS servers fall into four…
DNS root server
A DNS root server is the first stop in a DNS lookup. What is a DNS root server? The administration of the Domain Name System (DNS) is structured in a…
What is recursive DNS?
In DNS lookups, which match domain names to machine-readable IP addresses, the journey up the DNS tree can either be made by DNS. What is recursive DNS? A recursive DNS…
What is Anycast? | How does Anycast work?
Anycast is a network addressing and routing method in which incoming requests can be routed to various locations. What is Anycast? Anycast is a network addressing and routing method in…
What is a WAN? | WAN vs. LAN
A wide area network (WAN) is any network that extends over a large geographic area, usually connecting multiple local area networks (LANs). What is a wide area network (WAN)? A…
What is a router?
A router is a networking device that connects two or more IP networks or subnetworks and connects various networked nodes. What is a router? A router is a device that…