A point of presence (PoP) is a physical location where a network or service provider has equipment, such as routers, switches or servers, that customers, users or other networks can connect to. Carriers use PoPs to hand off circuits and exchange traffic; content delivery, security and SASE providers use them to serve users from a nearby location. A provider’s PoP list tells you where it can actually meet your traffic, which shapes both performance and the cost of connecting.
At a glance
- A PoP is a provider’s presence in a location, often a rack or cage in a data center or a carrier facility.
- Carriers use PoPs to connect customers, other carriers and the wider internet; cloud and security services use them to process user traffic close to the user.
- Distance to the nearest PoP affects latency, and its connections to other networks affect how well traffic flows onward.
- PoPs differ in size and in which services they offer, so a count alone says little.
- Buying circuits or cross-connects is often cheaper and faster in buildings where a provider already has a PoP.
What problem it solves
Networks need physical places to meet. A carrier cannot connect your office, a cloud provider or another network to its backbone unless it has equipment somewhere that both sides can reach. PoPs are those places: they are where access circuits terminate, where IP transit and peering connections are made, and where traffic enters the provider’s backbone.
For services that inspect or deliver traffic, such as a content delivery network (CDN) or secure access service edge (SASE), PoPs also solve a performance problem. Sending every user’s traffic to a handful of central sites adds distance and delay. Spreading PoPs across regions lets the service process traffic close to where users are, then hand it on to its destination.
How it works
Location. Many PoPs sit in carrier-neutral data centers and colocation facilities, where many networks are present and connections between them are quick to set up. Others are in carriers’ own buildings or smaller equipment sites.
Equipment. A carrier PoP typically holds routers and switches that terminate customer circuits and connect to the backbone. A CDN or SASE PoP also holds servers that cache content or run security inspection. The mix varies by provider and by PoP.
Interconnection. PoPs connect onward to the provider’s other PoPs over its backbone, and to other networks through transit, private peering or an internet exchange point (IXP). How well a PoP is connected determines how directly traffic reaches its destination.
Reaching a PoP. Customers reach a PoP over an access circuit, a cross-connect inside the same building, or the internet. Cloud services commonly direct users to the nearest healthy PoP using DNS or anycast routing, and many fail over to another PoP when one has a problem.
If you are comparing edge or security providers by their PoP footprint, our Secure Access Service Edge solution page covers what to check.
When it matters for buyers
- Choosing SASE, SSE or CDN providers. Check that PoPs exist near your users and offices, especially in regions outside the provider’s home market.
- Buying IP transit or private lines. A provider with a PoP in your data center can often deliver faster and cheaper than one that needs a new access circuit.
- Expanding internationally. Data residency rules and local performance can depend on which PoPs process your traffic.
- Troubleshooting slow cloud apps. Users sent to a distant or overloaded PoP often see higher latency.
Questions to ask vendors
- Which PoPs would our users and sites connect to, and how far away are they?
- Does every PoP offer the full service, or are some limited to certain features or traffic types?
- What happens to our traffic if the nearest PoP is unavailable, and how quickly does it move?
- How is each PoP connected to the cloud providers and networks we use most?
- Are the PoPs in your own facilities or in third-party data centers, and is capacity dedicated or shared?
- Can we control which PoPs or countries process our traffic?
How it differs from an internet exchange point
A PoP is one provider’s presence in a location. An internet exchange point (IXP) is shared switching infrastructure where many networks connect to exchange traffic with each other. Providers often place PoPs in buildings that host an IXP so they can join it, but the two are different things: one is where you reach a provider, the other is where providers reach each other.