1.2 Network Functions Flashcards
What are some key functions of network infrastructure?
Provides access to data from anywhere, remote access, secure communication, traffic management, prioritizes important applications, and ensures uptime and availability.
What is the purpose of a Content Delivery Network (CDN)?
To speed up data delivery by caching content on geographically distributed servers, allowing users to access data from a local server.
Where are CDNs typically used?
on many websites, used to : reduce bandwidth costs, increase scale, and decrease delivery time
What is the primary function of a Virtual Private Network (VPN)?
To provide secure, encrypted communication over an insecure network.
how are VPNs implemented
VPNs are implemented with specialized cryptographic hardware or software-based options.
What device often handles encryption and decryption in a VPN setup?
The concentrator or head-end device.
What is the purpose of Quality of Service (QoS)?
To manage and prioritize network traffic, ensuring that important applications get higher priority.
What devices commonly support QoS?
Routers, switches, firewalls, and QoS devices.
How does QoS manage traffic?
Through traffic shaping or packet shaping, controlling bandwidth usage or data rates.
Why is TTL used in networks?
To prevent packets from endlessly circulating, such as in routing loops.
What is a routing loop?
A situation where two routers continuously send packets to each other because they misconfigure their routing paths.
What is Time to Live (TTL)?
A timer that limits how long data is available or how many hops it can take before being dropped or stopped.
How is TTL used to prevent routing loops?
TTL limits the number of hops a packet can take before being dropped, preventing the packet from circulating forever.
How does IP handle routing loops?
IP uses TTL to drop a packet after a set number of hops, preventing loops from causing infinite packet circulation.
What is the default TTL value for Mac/Linux and Windows systems?
64 for Mac/Linux and 128 for Windows.
