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ECE 3325 (EXAM 1) 3

QuestionAnswer
Full buffers! Suppose that the output port has enough buffer space for only three packets, including the packet being transmitted What happens to packet 4 in the example above, when it arrives to find the output buffers full? Packet 4 is dropped or a queued packet is dropped from the buffer to make space for packet 4.
The network layer - where is it? Check all of the statements below about where (in the network) the network layer is implemented that are true. The network layer is implemented in routers in the network core. The network layer is implemented in hosts at the network's edge. The network layer is implemented in routers in the network core.
The control plane versus the data plane. For each of the actions below, select those actions below that are primarily in the network-layer data plane. The other actions that you don't select below then correspond to control-plane actions. Dropping a datagram due to a congested (full) output buffer. Looking up address bits in an arriving datagram header in the forwarding table. Moving an arriving datagram from a router’s input port to output port
What type of control plane? Which of the following actions occur in a per-router control-plane approach? The other actions that you don't select below then correspond to actions in an SDN control plane. A router exchanges messages with another router, indicating the cost for it (the sending router) to reach a destination host. Routers send information about their incoming and outgoing links to other routers in the network.
We've seen that there are two approaches towards implementing the network control plane... a per-router control-plane approach and a software-defined networking (SDN) control-plane approach.
Best effort service. Which of the following quality-of-service guarantees are part of the Internet’s best-effort service model? Check all that apply. None of the other services listed here are part of the best-effort service model. Evidently, best-effort service really means no guarantees at all! (anything with a guarantee is wrong)
What's inside a router? Match the names of the principal router components (A,B,C,D below) with their function and whether they are in the network-layer data plane or control plane. A. input ports, operating primarily in the data planeL B. the switching fabric, operating primarily in the data planeM C. output ports, operating primarily in the data planeR D. the routing processor, operating primarily in the control planeU
Where does destination address lookup happen? Where in a router is the destination IP address looked up in a forwarding table to determine the appropriate output port to which the datagram should be directed? At the input port where a packet arrives.
Where does "match+action" happen? Where in a router does "match plus action" happen to determine the appropriate output port to which the arriving datagram should be directed? At the input port where a packet arrives.
Packet dropping. Suppose a datagram is switched through the switching fabric and arrives to its appropriate output to find that there are no free buffers. In this case: The packet will either be dropped or another packet will be removed (lost) from the buffer to make room for this packet, depending on policy. But the packet will definitely not be be sent back to the input port.
HOL blocking. What is meant by Head of the Line (HOL) blocking? A queued datagram waiting for service at the front of a queue prevents other datagrams in queue from moving forward in the queue.
What is the Internet Protocol? What are the principal components of the IPv4 protocol? Packet handling conventions at routers (e.g., segmentation/reassembly) IPv4 addressing conventions. IPv4 datagram format.
he IPv4 header. Match each of the following fields in the IP header with its description, function or use: Version field This field contains the IP protocol version number.
The IPv4 header. Match each of the following fields in the IP header with its description, function or use: Fragmentation offset field This field is used for datagram fragmentation/reassembly.
he IPv4 header. Match each of the following fields in the IP header with its description, function or use: Type-of-service field This field contains ECN and differentiated service bits.
he IPv4 header. Match each of the following fields in the IP header with its description, function or use: Time-to-live field The value in this field is decremented at each router; when it reaches zero, the packet must be dropped.
he IPv4 header. Match each of the following fields in the IP header with its description, function or use: Header checksum field This field contains the Internet checksum of this datagram's header fields.
he IPv4 header. Match each of the following fields in the IP header with its description, function or use: Upper layer field This field contains the "protocol number" for the transport-layer protocol to which this datagram's payload will be demultiplexed - UDP or TCP
he IPv4 header. Match each of the following fields in the IP header with its description, function or use: Payload/data field This field contains a UDP or TCP segment, for example.
he IPv4 header. Match each of the following fields in the IP header with its description, function or use: Datagram length field. This field indicates the total number of bytes in datagram.
What is an IP address actually associated with? Which of the following statements is true regarding an IP address? IP address associated with an interface. If a router and host has more than one interface, then it has more that one IP address at which it can be reached.
What is a subnet? What is meant by an IP subnet? A set of device interfaces that can physically reach each other without passing through an intervening router. A set of devices that have a common set of leading high order bits in their IP address.
Plug-and-play. What is meant by saying that DHCP is a "plug and play" protocol No manual configuration is needed for the host to join the network.
Created by: DylanCanalesMane
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