Answer:  E 

Explanation:

Switch have single collision domain at each switch port. A collision domain is a segment that is shared by a connected medium through repeaters and data may collide with each other while sending or receiving. It is applicable more in wireless networks however this was also present in wired network as well. Collision occurs when multiple devices tries to send data in the same network segment at the same time. While sending the data, probability increases that the data may collide with each other. If we have to avoid collision, then only one device may send and only one device may receive and by following this process we can avoid collision. Increase in collision will directly impact the efficiency of the network as the device might have to retransmit the lost packet multiple times.

• a. Routers generally do not allow broadcast traffic to pass through them and whenever a broadcast hits a router, it is stopped there and is not forwarded further. Router and VLAN breaks broadcast domain.
• b. Trunk ports are point to point links that connects one or more switches and other networking devices and it is used to provide VLAN identification for frames travelling between switches. Traffic from all VLANs is sent and received by a trunk port. There are multiple interface modes that can be configured on a device. Trunk negotiation is managed by DTP.
• c. DTP is a point to point protocol used to make dynamic trunk link between switches without using any manual configuration. It is a Cisco proprietary protocol and it can negotiate trunking on a link between two VLAN aware switches.
• d. CAM table or content addressable memory table is used to save mac address table. This is present in all switches. It records mac address of stations and its corresponding port location.