Domain Name System (DNS)
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- every computer connected to the Internet has a unique identity
- can refer any Internet-connected machine in two ways: IP address (four
part string) or host name (a text string)
- Internet DNS can translate host name into equivalent IP address and vice
versa
,Exploit DNS for DDoS
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- send queries with spoofed source address: target IP
- requires amplification
Status Code: 200
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OK
DSL
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- Digital Subscriber Line
- use existing telephone line to central office DSLAM
TDM
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, - Time Division Multiplexing
- technique of putting multiple data streams in a single signal by separating
the signal into many segments, each having a short duration
"Generic" Top-level Domains (TLDs)
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- .edu, educational
- .com, commercial
- .gov, government
- .org, non profit
- .net, networking organizations
Circuit Switching vs Packet Switching (Packet Switching)
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- no physical path
- packets travel independently
- does not reserve bandwidth
- no bandwidth wastage
- supports store and forward transmission
Queuing Delay
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, - varies from packet to packet
- statistical measurements
- probability that delay exceeds some cutoffs
- depends on burst or periodic nature of traffic
If we're sending a file of 640,000 bits using TDM with 24 slots with a bit rate of 1.536
Mbps and 500 msec to establish the connection. How long does it take to send the
file?
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Each circuit has a TR = 1.536/24 = 64 kbps
640,000/64000 = 10 sec
10 + 0.5 = 10.5 sec
How much time to distribute file from one server to N peers? (Client-Server)
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- server transmission: must sequentially send (upload) N file copies
- time to send one copy = F/u
- time to send N copies = NF/u
- client: each client must download file copy
- min client download time = F/dmin
Queuing and Packet Loss
Give this one a try later!
Give this one a try later!
- every computer connected to the Internet has a unique identity
- can refer any Internet-connected machine in two ways: IP address (four
part string) or host name (a text string)
- Internet DNS can translate host name into equivalent IP address and vice
versa
,Exploit DNS for DDoS
Give this one a try later!
- send queries with spoofed source address: target IP
- requires amplification
Status Code: 200
Give this one a try later!
OK
DSL
Give this one a try later!
- Digital Subscriber Line
- use existing telephone line to central office DSLAM
TDM
Give this one a try later!
, - Time Division Multiplexing
- technique of putting multiple data streams in a single signal by separating
the signal into many segments, each having a short duration
"Generic" Top-level Domains (TLDs)
Give this one a try later!
- .edu, educational
- .com, commercial
- .gov, government
- .org, non profit
- .net, networking organizations
Circuit Switching vs Packet Switching (Packet Switching)
Give this one a try later!
- no physical path
- packets travel independently
- does not reserve bandwidth
- no bandwidth wastage
- supports store and forward transmission
Queuing Delay
Give this one a try later!
, - varies from packet to packet
- statistical measurements
- probability that delay exceeds some cutoffs
- depends on burst or periodic nature of traffic
If we're sending a file of 640,000 bits using TDM with 24 slots with a bit rate of 1.536
Mbps and 500 msec to establish the connection. How long does it take to send the
file?
Give this one a try later!
Each circuit has a TR = 1.536/24 = 64 kbps
640,000/64000 = 10 sec
10 + 0.5 = 10.5 sec
How much time to distribute file from one server to N peers? (Client-Server)
Give this one a try later!
- server transmission: must sequentially send (upload) N file copies
- time to send one copy = F/u
- time to send N copies = NF/u
- client: each client must download file copy
- min client download time = F/dmin
Queuing and Packet Loss
Give this one a try later!
