Module 1 / Unit 3 Hubs, Bridges, and Switches Flashcards
On completion of this unit, you will be able to: □ Install and configure hubs, bridges, and switches. □ Understand the use of spanning tree to prevent switching loops.
True or false? Devices can only transmit on an Ethernet network when it is free and the opportunity to transmit becomes less frequent as more devices are added. Also the probability of collisions increases. These problems can be overcome by installing a hub
False. The description of the problem is true but the solution isn’t (use a switch)
True or false? A bridge does not forward broadcast or multicast traffic.
False. Ports on a bridge are in the same broadcast domain.
What is microsegmentation?
Each switch port creates a separate collision domain for each attached host, essentially eliminating the effect of collisions on network performance.
How does a switch keep track of the hardware addresses of hosts connected to its ports?
It uses a table stored in Content Addressable Memory (CAM)
What is happening if a switch is flooding?
It is sending frames out on all ports. This typically happens when it is learning MAC addresses.
True or false? Switch ports should normally be set to autonegotiate speed and duplex settings.
True; speed / duplex setting only very rarely needs to be manually configured on modern networks.
What is the function of STP?
Spanning Tree Protocol prevents switching loops (where broadcast traffic is continually looped around a switched network with redundant links between switches).
Under STP, if a host port is working as normal, what state is it in?
Forwarding.
What mechanisms protect the switching infrastructure from malicious STP traffic?
Configuration settings such as BPDU Guard and BPDU Filter prevent hosts from injecting Bridge Protocol Data Units (BPDU) into the network. Root guard prevents devices from attempting to become root.
What is PoE?
Power over Ethernet - an IEEE specification for delivering power to devices from switch ports over network cabling.
