Software Defined Network Flashcards
SDN (Software Defined Networking)
what does this process consist of
we take devices like switch routers firewalls and other networking devices and change them to be a software based platform that we can use in the cloud
SDN is the process of changing networking devices into software we can use in the cloud
what does it stand for SDN
Software Defined Networking
With SDN software defined networking what is the process of changing networking devices into software we can use in the cloud
Split the functions of network devices into separate logical units and create software versions of the functionalities
With software defined networking there are 3 layers to split of networking devices into categories
- Infrastructure layer / Data plane
- responsible for handling the actual data packets or traffic that flow through a network or system.
- Control layer / Control plane
- responsible for managing and controlling the operation of the infrastructure or data plane.
- Application layer / Management plane
-provides interfaces and tools for human administrators to configure, monitor, and manage the infrastructure.
With software defined networking there are 3 layers to split of networking
What is the function of the first layer
* Infrastructure layer / Data plane
It is responsible for handling the actual data packets and frames as they traverse the network. Within the infrastructure layer, several key functions take place, including forwarding, trunking, encrypting, and Network Address Translation (NAT).
What is forwarding in networking
It involves making decisions about where to send incoming data packets or frames based on their destination addresses. Switches and routers play a crucial role in forwarding traffic. Switches make forwarding decisions at the Layer 2 (Data Link Layer) based on MAC addresses, while routers operate at Layer 3 (Network Layer) and use IP addresses for forwarding decisions.
What is trunking in networking
client send a broadcast to a switch to a port assigned to Vlan1 on the other side of the switch there is an one ethernet cable that goes to another switch
broad cast is trying to communicate with a client on a different Vlan on the opposite side of switch 2
All Vlans are allowed a trunk so before the switch forwards the broadcast it tags it that tags tells the next switch which Vlan the data packet/broadcast belongs to and then the next switch knows where to forward it
kid on the airplane
his is commonly implemented using protocols like IEEE 802.1Q, which adds a VLAN tag to Ethernet frames to identify which VLAN they belong to.
Encryption is the process of
securing data by converting it into a format that is unreadable without the appropriate decryption key. encryption can be applied to data packets to protect their confidentiality and integrity as they traverse the network. VPN (Virtual Private Network) tunnels, for example, often employ encryption to ensure that data is secure when transmitted over public networks.
NAT
network address translation
to translate a set of IP address to another set of IP addresses
To preserve the IPv addresses they created the ability for private ip address NAT connects the two
NAT devices, such as routers, maintain a translation table to track which internal IP addresses correspond to specific external (public) IP addresses and ports.
- Control layer / Control plane In software defined networking
The control plane is responsible for managing and controlling the actions of the data plane, ensuring that data packets are forwarded correctly and efficiently. Key functions of the control plane include managing routing tables, session tables, NAT tables, and dynamic routing protocol updates.
What is a routing table
critical components of routers and Layer 3 (Network Layer) switches. They contain information about the network topology, including routes to various destinations (identified by network prefixes or IP addresses) and the next-hop routers or interfaces to reach those destinations. The routing tables are consulted by routers when making forwarding decisions. The control plane is responsible for building, updating, and maintaining these routing tables to ensure that data packets are routed along the optimal paths.
What are session tables
Session tables, also known as connection tables or state tables, are used in network devices like firewalls and stateful inspection routers. These tables keep track of active network connections by recording details such as source and destination IP addresses, port numbers, and connection state (e.g., established, closed, or waiting). The control plane manages session tables to enable stateful packet inspection and to make access control decisions based on the state of network connections.
- Application layer / Management plane
– Configure and manage the device
– SSH, browser, API
RFID radio-frequency identification
Access badges
inventory line tracking
anything that needs to be tracked
Radar technology
