The Transport Layer
... • Most file transactions are not long enough • Consequently, TCP can spend a lot of time with small windows, never getting the chance to reach a sufficiently large window size • Fix: Allow TCP to build up to a large window size initially by doubling the window size until first loss ...
... • Most file transactions are not long enough • Consequently, TCP can spend a lot of time with small windows, never getting the chance to reach a sufficiently large window size • Fix: Allow TCP to build up to a large window size initially by doubling the window size until first loss ...
Transport Protocols
... Discarding of corrupted packets Retransmission of lost packets Flow control Congestion control (next lecture) ...
... Discarding of corrupted packets Retransmission of lost packets Flow control Congestion control (next lecture) ...
Assume a machine for which a char takes 1 byte
... do is send an IP packet to the local DHCP server. b. In Mobile IP, a mobile host is no long reachable at its “home address” as soon as it migrates to a foreign network. c. A home agent impersonates the network address of its mobile client while the client roams outside its home network. d. A mobile ...
... do is send an IP packet to the local DHCP server. b. In Mobile IP, a mobile host is no long reachable at its “home address” as soon as it migrates to a foreign network. c. A home agent impersonates the network address of its mobile client while the client roams outside its home network. d. A mobile ...
NAME: Computer Science 461 Midterm Exam March 14, 2014
... do is send an IP packet to the local DHCP server. b. In Mobile IP, a mobile host is no long reachable at its “home address” as soon as it migrates to a foreign network. c. A home agent impersonates the network address of its mobile client while the client roams outside its home network. d. A mobile ...
... do is send an IP packet to the local DHCP server. b. In Mobile IP, a mobile host is no long reachable at its “home address” as soon as it migrates to a foreign network. c. A home agent impersonates the network address of its mobile client while the client roams outside its home network. d. A mobile ...
downloading
... to the end of its physical trajectory • The velocity of propagation of the circuit depends mainly on the actual distance of the physical circuit • In the majority of cases this is close to the speed of light. For d = distance, s = propagation velocity ...
... to the end of its physical trajectory • The velocity of propagation of the circuit depends mainly on the actual distance of the physical circuit • In the majority of cases this is close to the speed of light. For d = distance, s = propagation velocity ...
Network Protocols
... • Implications of timeout period at a sender – Too long unnecessary waiting – Too short a message is transmitted when an acknowledgement is in transit ...
... • Implications of timeout period at a sender – Too long unnecessary waiting – Too short a message is transmitted when an acknowledgement is in transit ...
Midterm Review - UTK-EECS
... required by application layer, TCP vs. UDP services and their suitability for different applications Protocols: comparative study of HTTP, FTP, Email and DNS (e.g., in-band/out-of-band, stateless/ stateful, pull/push), be able to describe how each protocol operates (using key components and their in ...
... required by application layer, TCP vs. UDP services and their suitability for different applications Protocols: comparative study of HTTP, FTP, Email and DNS (e.g., in-band/out-of-band, stateless/ stateful, pull/push), be able to describe how each protocol operates (using key components and their in ...
: Integrated Measurement and Analysis In-House Environment B. Rathke
... infer about the internal Internet protocol variables [6]. The accuracy of this inference depends on the completeness of the trace, i.e. each lost sample falsi es the conclusions about the protocol variables and makes performance evaluations inaccurate. Therefore it is necessary to measure directly w ...
... infer about the internal Internet protocol variables [6]. The accuracy of this inference depends on the completeness of the trace, i.e. each lost sample falsi es the conclusions about the protocol variables and makes performance evaluations inaccurate. Therefore it is necessary to measure directly w ...
RTT M
... starts. Note that the sender does not start an RTT measurement when it sends the ACK segment, because it does not consume a sequence number and there is no time-out. No RTT measurement starts for the second data segment because a measurement is already ...
... starts. Note that the sender does not start an RTT measurement when it sends the ACK segment, because it does not consume a sequence number and there is no time-out. No RTT measurement starts for the second data segment because a measurement is already ...
L17
... – Additive increase improves fairness and efficiency – Multiplicative decrease moves the system towards efficiency without altering fairness ...
... – Additive increase improves fairness and efficiency – Multiplicative decrease moves the system towards efficiency without altering fairness ...
cwnd
... TCP: detecting, reacting to loss loss indicated by timeout: • cwnd set to 1 MSS; • window then grows exponentially (as in slow start) to threshold, then grows linearly loss indicated by 3 duplicate ACKs: TCP RENO • dup ACKs indicate network capable of delivering ...
... TCP: detecting, reacting to loss loss indicated by timeout: • cwnd set to 1 MSS; • window then grows exponentially (as in slow start) to threshold, then grows linearly loss indicated by 3 duplicate ACKs: TCP RENO • dup ACKs indicate network capable of delivering ...
Interacting Network Elements: Chaos and Congestion Propagation
... congestion propagation in a sequence of highly congested routers at Keo University, Japan in 1999. We think that this phenomenon will be a general feature in the new network environments. It will be verified why such propagation occurs in TCP/IP traffic. ...
... congestion propagation in a sequence of highly congested routers at Keo University, Japan in 1999. We think that this phenomenon will be a general feature in the new network environments. It will be verified why such propagation occurs in TCP/IP traffic. ...
NAME: Computer Science 461 Midterm Exam March 14, 2014
... Right after the sender’s congestion window has reached a size of 16KB, a timeout occurs. After the timeout is detected, the sender continues sending more data over the established connection. 1.B) Assuming no additional packet loss or timeouts, how long (since the observed timeout) will it take for ...
... Right after the sender’s congestion window has reached a size of 16KB, a timeout occurs. After the timeout is detected, the sender continues sending more data over the established connection. 1.B) Assuming no additional packet loss or timeouts, how long (since the observed timeout) will it take for ...
Src
... • Given a receiver window size of 8K, what is the chance that a RST packet with a random sequence number will terminate the connection? • How many RST packets are needed to span the entire sequence number space? • Using 58 byte RST packets on a 10 Mbps link, how long does it take to generate this nu ...
... • Given a receiver window size of 8K, what is the chance that a RST packet with a random sequence number will terminate the connection? • How many RST packets are needed to span the entire sequence number space? • Using 58 byte RST packets on a 10 Mbps link, how long does it take to generate this nu ...
The Transport Layer
... • Buffering out-of-order segments in the receiver • Sender detects missing segments by looking at duplicate ACK’s (NACK’s can not be used) and retransmits before the timer expires. Improved congestion control: • look also to duplicate ACK’s to lower the congestion window to half its value • start fr ...
... • Buffering out-of-order segments in the receiver • Sender detects missing segments by looking at duplicate ACK’s (NACK’s can not be used) and retransmits before the timer expires. Improved congestion control: • look also to duplicate ACK’s to lower the congestion window to half its value • start fr ...
Powerpoint
... • One output to multiple users with varied capabilities • Who decides the rate? • What is the network capacity ? ...
... • One output to multiple users with varied capabilities • Who decides the rate? • What is the network capacity ? ...
COS 420 day 11 & 12& 13
... Self-clocking startup to increase transmission rate rapidly as long as no packets are lost When starting traffic, initialize the congestion window to the size of a single maximum sized segment Increase congestion window by size of one segment each time an ACK arrives without retransmission ...
... Self-clocking startup to increase transmission rate rapidly as long as no packets are lost When starting traffic, initialize the congestion window to the size of a single maximum sized segment Increase congestion window by size of one segment each time an ACK arrives without retransmission ...
Wireless TCP(September 20)
... wireless loss but sender often stalls due to timeouts on the wireless connection resulting in poor end-to-end throughput. Adding a SMART-based selective acknowledgement mechanism for split-connection approaches yields good throughput but not quite as good as for TCP-aware link-layers. ...
... wireless loss but sender often stalls due to timeouts on the wireless connection resulting in poor end-to-end throughput. Adding a SMART-based selective acknowledgement mechanism for split-connection approaches yields good throughput but not quite as good as for TCP-aware link-layers. ...