ISC2 CISSP (Certified Information Systems Security Professional)Communication and Network SecurityMedium
A financial institution is implementing a new trading platform that requires extremely low latency and high throughput for real-time market data distribution across its global network. The network architect is evaluating technologies that can optimize packet forwarding by avoiding repeated lookup processes at each hop, while also supporting quality of service (QoS) and traffic engineering. Which of the following technologies would BEST meet these requirements?
- ASoftware-Defined Networking (SDN)
- BMultiprotocol Label Switching (MPLS)
- CVirtual Private Network (VPN)
- DNetwork Access Control (NAC)
Show answer & explanationAnswer & explanation
Correct answer: B. Multiprotocol Label Switching (MPLS)
MPLS accelerates packet forwarding by assigning short path labels to packets at the ingress edge of a network. Subsequent routers (Label Switch Routers) forward packets based solely on these labels, avoiding complex IP header lookups, which significantly reduces latency and increases throughput. It also inherently supports QoS and traffic engineering.
Why the other options are wrong
- A. SDN provides centralized control over network infrastructure but is an architectural approach, not a direct packet forwarding optimization technology for low latency.
- C. VPNs provide secure, encrypted tunnels but add overhead and latency, not optimizing forwarding for speed.
- D. NAC controls endpoint access to a network but does not address packet forwarding efficiency or latency.
Multiprotocol Label Switching (MPLS)
A high-performance packet-forwarding technology that directs data from one network node to the next based on short path labels rather than long network addresses, avoiding complex lookups and speeding up traffic flow.
- Operates between Layer 2 and Layer 3 (Layer 2.5).
- Uses labels for faster forwarding decisions.
- Supports Quality of Service (QoS) and traffic engineering.
- Commonly used in large enterprise and service provider networks.
Memory trick: MPLS: Maximum Performance, Label Speed.