STUFFFFFF Flashcards
Transport Layer
End-to-end error control.
End-To-End connection between hosts.
What allows data to be transfered be tween hosts
Think TCP/UDP
Presentation Layer
Coding 1s and 0s; encryption, compression.
This is what formats and encrypts data to be sent across the network.
SSL sits here, whgich encrypts the link between web server and browser.
This layer is also responsible for formatting and translating data into text or information.
Layer 4
Transport Layer
Layer 7
Application Layer
Layer 6
Presentation Layer
Layer 1
Physical Layer
Network Layer
Network addressing, routing and switching technology. (Layer 3 issues are usually happen to do with routers and switches, or things like RIP, OSPF.
Layer 3
Network Layer
Physical Layer
Think NICS, ethernet devices physically, topologies.
Maintains the data rate (how many bits a sender can send per second) through different physical technologies and limits of those technologies.
Define VPN
A Virtual Private Network is an encrypted connection between two locations on an already existing network. A VPN is commonly chosen between a Site-To-Site, or client-to-site VPN. A site-to-site VPN links two networks remotely in order for them to communicate as if they were local over an encrypted connect. A Client-to-site VPN is an encrypted connection between a single host and a network. This is commonly used for connecting to a work site from home in order to perform remote work or access data that you dont want to be seen over the regular internet.
Define OSPF
Open Shortest Path First is an Ip routing protocol that is a link-state protocol, meaning it exchanges information with its closest neighbours. The entire topology or “map” of the network allows all routers in the OSPF group to calculate the shortest path it needs to travel to deliver data to its destination.
Session Layer
Authentication, permissions, session restoration. Responsible for syncrhonizing information from different sources (think taking two people and initiating a session so they can talk)
What is the difference between HTTP and HTTPS?
HTTPS is HTTP with encryption and verification. The only difference between the two protocols is that HTTPS uses TLS (SSL) to encrypt normal HTTP requests and responses, and to digitally sign those requests and responses.
How do you feel about Agile? Can you explain its benefits and drawbacks?
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What is the difference between a firewall and proxy server?
A firewall monitors and filters traffic based on a set of defined rules and limits ingoing AND outgoing. A proxy server allows external hosts to connect to services on an internal network, without actually viewing the information of that internal network. (Think of it as what is used to connect to a webserver from the internet).
