Terms Flashcards
What is a client ?
A device that accesses a service made availible by a server
What is a server ?
A device that provides functions or services for clients
What are switches ?
- Have many network interfaces/ports for end hosts to connect to
- Provide connectivity to hosts within the same LAN (Local Area Network)
- DO NOT provide connectivity between LANs (over the internet)
What are routers
- Router provide connectivity between LANs
- Routers are used to send data over the internet
What are firewalls ?
- Firewalls monitor and control network traffic based on configured rules
- Can be placed inside and outside the network
What is a network ?
A computer network is a digital telecommunications network which allows nodes to share resources
What is auto-MDIX ?
When automatic medium-dependent interface crossover (auto-MDIX) is enabled on an interface, the interface automatically detects the required cable connection type (straight through or crossover) and configures the connection appropriately.
What is an SFP Transceiver ?
Small form-factor pluggable (SFP) transceivers are compact, hot-swappable transceivers that support speeds up to 4.25Gbps. SFPs are used to provide communication between switches and other network components, such as routers. They are popular because of their small size, versatile connection options, and hot swappable capability. They are used with copper or fiber optic cables.
What is the OSI Model ?
Open Systems Interconnection Model (7 Layers)
7 Application - HTTP & HTTPS (Protocols that interact with applications)
6 Presentation - Translate between application and network formats
5 Session - Controls sessions between communicating hosts
4 Transport - Segments and reassembles data for communications between end hosts (adds L4 header / Segment)
3 Network - Routers operate on L3. Provides connectivity between end hosts on different networks. It provides logical addressing (IP) and adds L3 header / Packet.
2 Data Link - Provides node to node connectivity (PC to switch) and adds L2 header and trailer/ Frame. Switches operate at L2.
1 Physical - Digital bits converted to electrical signals and sent through physical cables
What is encapsulation ?
Encapsulation is the process of adding additional information to data as it travels through a computer network. This additional information is added at the sender’s side, starting from the Application layer to the Physical layer. The lower layer encapsulates the higher layer’s data between a header.
What is de-encapsulation ?
Decapsulation is the process of removing headers and trailers from a packet as it moves toward its destination. This process happens on the computer that is receiving data.
What is full-duplex ?
Device is able to send and recieve data at the same time. Switches are full duplex.
What are Network Firewalls ?
Hardware devices that filter traffic between networks
What are Host-Based Firewalls ?
Software applications that filter traffic entering and exiting a host machine, like a PC
