ESAT Forouzan - Chapter 23: Congestion Control and Quality of Service Flashcards
The maximum length of time that traffic is generated at the peak rate is called the ___________.
a. Average data rate
b. Maximum burst size
c. Effective bandwidth
d. Constant bit rate
b. Maximum burst size
The ____ is the maximum data rate of the traffic
a. Average data rate
b. Peak data rate
c. Maximum burst size
d. Effective bandwidth
b. Peak data rate
The effective bandwidth is based on _________.
a. Average data rate
b. Peak data rate
c. Maximum burst size
d. All of the above
d. All of the above
_____traffic features sudden data rate changes in very short periods of time.
a. Constant-bit-rate
b. Variable-bit-rate
c. Bursty
d. Peak-bit-rate
c. Bursty
When the load is greater than the capacity, the delay _______
a. Decreases
b. Increases linearly
c. Goes to infinity
d. Goes to zero
c. Goes to infinity
______ is a closed loop mechanism to alleviate congestions
a. A choke point
b. Implicit signaling
c. Explicit signaling
d. All of the above
d. All of the above
For a system using TCP, the sender window size is determined by the _____ window size
a. Receiver
b. Sender
c. Congestion
d. (a) and (c)
d. (a) and (c)
Slow start is used in conjunction with ______as a TCP congestion control strategy
a. Additive increase
b. Additive decrease
c. Multiplicative increase
d. Multiplicative decrease
a. Additive increase
The FECN informs the _____ of congestion while the BECN informs the _____ of congestion
a. Destination; interface
b. Destination; sender
c. Sender; destination
d. Interface; sender
b. Destination; sender
_____ is a flow characteristic in which the delay varies for packets belonging to the same flow
a. Choke point
b. Throughput
c. Additive increase
d. Jitter
c. Additive increase
In _____ queuing the first packet into the queue is the first packet out of the queue
a. FIFO
b. LIFO
c. Priority
d. Weighted fair
a. FIFO
The ____ traffic shaping method gives a host credit for its idle time
a. Leaky bucket
b. Token bucket
c. Traffic bucket
d. Bursty bucket
b. Token bucket
A flow-based QoS model designated for IP is called________
a. Integrated services
b. Differentiated services
c. RSVP
d. Multicast trees
a. Integrated services
A signaling protocol that helps IP create a flow is called _____
a. Integrated services
b. Differentiated services
c. RSVP
d. Multicast trees
c. RSVP
RSVP uses _____ messages
a. Path
b. Resv
c. Resource
d. (a) and (b)
d. (a) and (b)
In a RSVP reservation style called ______ filter, the router creates a single reservation that can be shared by a set of flows.
a. Wild card
b. Fixed
c. Shared explicit
d. All of the above
c. Shared explicit
Differentiated services was designed to handle the ______ problem associated with Integrated Services
a. Scalability
b. Stability
c. Reservation
d. All of the above
a. Scalability
A ____ is a Differentiated Services traffic conditioner
a. Meter
b. Marker
c. Shaper
d. All of the above
c. Shaper
When added to Be, Bc should be less than the ________
a. CIR
b. Access rate
c. Committed burst size
d. (a) and (b)
b. Access rate
What is the relationship between the access rate and the CIR?
a. CIR is always equal to the access rate
b. CIR is greater than the access rate
c. CIR is less than the access rate
d. CIR plus Bc is equal to the access rate
c. CIR is less than the access rate
A Frame Relay network is committed to transfer ______ bps without discarding any frames
a. Bc
b. Be
c. CIR
d. (a) and (b)
a. Bc
In Frame Relay the transmission rate can never exceed _____.
a. Bc
b. Be
c. CIR
d. The access rate
d. The access rate
The cell _______ is the difference between the CTD maximum and minimum
a. Loss ratio
b. Transfer delay
c. Delay variation
d. Error ratio
c. Delay variation
The cell ____ is the ratio of lost cells to cells sent
a. Loss ratio
b. Transfer delay
c. Delay variation
d. Error ratio
a. Loss ratio
The _____ service class is particularly suitable for applications with bursty data
a. CBR
b. VBR
c. ABR
d. UBR
c. ABR
The _____ service class is suitable for customers who need real-time video transmission without compression
a. CBR
b. VBR
c. ABR
d. UBR
a. CBR
The ______ is greater than the SCR.
a. PCR
b. MCR
c. CVDT
d. All of the above
a. PCR
________ measures the variation in cell transmission time
a. SCR
b. PCR
c. MCR
d. CVDT
d. CVDT
If the SCR is 60 000, the PCR is 70 000 and the MCR is 55 000, what is the minimum number of cells that can be sent per second?
a. 55 000
b. 60 000
c. 70 000
d. 5000
a. 55 000
The ____ is the fraction of the cells delivered in error
a. CLR
b. CTD
c. CDV
d. CER
d. CER
If the maximum CTD is 10 μs and the minimum CTD is 1μs, the _______ is 9μs
a. CLR
b. CTD
c. CDV
d. CER
c. CDV
