Actually, an IDS does not sit on one particular layer. It has to examine packets for protocols, how they are being transported, number of packets transmitted, spoofing information, and application layer information.
In general terms, Intrusion detection system and Intrusion prevention system is a Layer 4 device. It filters for malicious data.
IDS
VSAT is a layer 2 device.
Transport Layer
Using jumpers or rotary dials (or another type of switch) on the device itself
you gain another layer of security.
A Switch is a Layer 2 device as they operate in the data link layer
layer of sand then a layer of activated charcoal then a layer of gravel.
There are no layer 1 switches; switches run at layer 2 or 3. A hub is a layer 1 device.
because one layer is the electrical part, and the other layer is the place where the switch is on.
Physical layer
i do no
firewall, router,layer 3 switches and i approve that answer ! NO! In general the firewall is a layer 4 device, it traffics filter incoming and outgoing ports. It uses the function of TCP and UCP. However a Firewall can also be a layer 3 device as in internal firewall in a router. Also a switch is a layer 2 device unless your talking about a Router switch.