Quiz 3 (Ch 6-8): Data Link Layer, Ethernet switching, and Network Layer CRC Fa22 CISN 304
Which statement is true about the CSMA/CD access method that is used in Ethernet?
All network devices must listen before transmitting.
What are three ways that media access control is used in networking? (Choose three.)
Data link layer protocols define the rules for access to different media. Ethernet utilizes CSMA/CD. Media access control provides placement of data frames onto the media.
When transporting data from real-time applications, such as streaming audio and video, which field in the IPv6 header can be used to inform the routers and switches to maintain the same path for the packets in the same conversation?
Flow Label
Which statement describes a feature of the IP protocol?
IP relies on upper layer services to handle situations of missing or out-of-order packets.
Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)
Implements a trailer to detect transmission errors. Controls the NIC responsible for sending and receiving data on the physical medium.
What is a characteristic of the LLC sublayer?
It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.
Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
Places information in the frame that identifies which network layer protocol is being used for the frame. Adds Layer 2 control information to network protocol data.
Within a production network, what is the purpose of configuring a switch with a default gateway address?
The default gateway address is used to forward packets originating from the switch to remote networks.
What action will occur if a host receives a frame with a destination MAC address it does not recognize?
The host will discard the frame.
What action will occur if a host receives a frame with a destination MAC address of FF:FF:FF:FF:FF:FF?
The host will process the frame.
What action will occur if a switch receives a frame with the destination MAC address 01:00:5E:00:00:D9?
The switch forwards it out all ports except the ingress port.
What action will occur if a switch receives a frame with the destination MAC address FF:FF:FF:FF:FF:FF?
The switch forwards it out all ports except the ingress port.
What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?
The switch refreshes the timer on that entry.
How do hosts ensure that their packets are directed to the correct network destination?
They have to keep their own local routing table that contains a route to the loopback interface, a local network route, and a remote default route.
What is contained in the trailer of a data-link frame?
error detection
Which switching method has the lowest level of latency?
fast-forward
What are two examples of the cut-through switching method? (Choose two.)
fast-forward switching fragment-free switching
A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topology provides high availability and connects some, but not all, remote sites?
partial mesh
A Layer 2 switch is used to switch incoming frames from a 1000BASE-T port to a port connected to a 100Base-T network. Which method of memory buffering would work best for this task?
shared memory buffering
What three items are contained in an Ethernet header and trailer? (Choose three.)
source MAC address error-checking information destination MAC address
What is the auto-MDIX feature on a switch?
the automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection
What is the purpose of the FCS field in a frame?
to determine if errors occurred in the transmission and reception
Which term describes a field in the IPv4 packet header that contains a 4-bit binary value set to 0100?
version
