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…
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 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…
What is a network switch? | Switch vs. router
A network switch forwards data packets between devices. Switches send packets directly to devices; it differs network traffic from a router. What is the difference between a switch and a…
What is the network layer? | Network vs. Internet layer
The network layer is layer 3 in the OSI model, responsible for connections between different networks. What is the network layer? Network-to-network connections are what make the Internet possible. The…