16 Questions
What is the relationship between La/R and average queueing delay?
When La/R approaches 0, average queueing delay is small; when La/R approaches 1, average queueing delay is large; and when La/R is greater than 1, average delay is infinite.
What happens when the average packet arrival rate exceeds the service rate of bits?
The average delay becomes infinite because more work arrives than can be serviced.
What is the purpose of the traceroute program?
To provide delay measurements from the source to routers along the end-end Internet path towards the destination.
In what type of switching does each packet follow a separate path through the network?
Packet-switching.
What is store and forward?
A method of packet transmission where each router stores a packet received from the previous node and then forwards it to the next node.
What is a primary advantage of packet switching in bursty data transmission?
Resource sharing is simpler, and there is no call setup
What is a potential drawback of packet switching in terms of congestion?
Excessive congestion is possible due to buffer overflow, resulting in packet delay and loss
What is the key challenge in designing packet-switching systems?
Providing circuit-like behavior with packet switching
How does store and forward relate to packet switching?
Store and forward is a technique used in packet switching to transmit packets, where packets are stored in buffers before being forwarded to the next hop
What is a key difference between circuit switching and packet switching in terms of resource allocation?
Circuit switching reserves resources for the entire duration of the connection, whereas packet switching allocates resources on-demand
What happens when a packet arrives at a full buffer in a queue?
The packet is dropped or lost.
What is the term for the rate at which bits are being sent from sender to receiver?
Throughput
In a store-and-forward packet-switching network, what happens to a packet when it arrives at a router?
The packet is stored in a buffer before being forwarded to the next hop.
What is the term for the delay introduced when a packet is stored in a buffer before being transmitted?
Store-and-forward delay
What happens to a packet that is lost in transit in a packet-switching network?
It may be retransmitted by the previous node, the source end system, or not at all.
What is the relationship between the transmission rate Rs and link capacity Rc in a network?
Rs should be less than Rc for efficient transmission.
Learn about packet queueing delay, traffic intensity, and how it relates to packet arrival rate, packet length, and link bandwidth. Understand the impact of traffic intensity on average queueing delay.
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