Class Notes for Alex Snoeren

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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 10: Internet Control Message Protocol, Future Proof, Loopback

OC9487303 Page
19 Oct 2018
0
But the router will keep dropping this packet! Router detects a problem with the packet! If the router drops the packet, the sender will resend it! Nee
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 7: Local Area Network, Collision Domain, Collision Detection

OC9487303 Page
13 Oct 2018
0
One shared link (bus) limits scale in terms of. We don"t have to share air spaces in time. Better alternative is to have multiple busses. Need ability
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 3: Bit Stuffing, Hamming Distance, Clock Drift

OC9487302 Page
3 Oct 2018
0
Stuffer will stick a dle in front of stx/etx. The more fine-grained, the less it"ll work! Prefix w/ another special char, dle (data-link escape) Exists
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 1: Sliding Window Protocol, Link Layer, Master Sergeant

OC9487302 Page
3 Oct 2018
0
P1 due 6pm oct, 29th (right before midterm!) End-to-end argument - functionality should be implemented at a lower layer iff it can be correctly and com
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 2: Request For Comments, Hypertext Transfer Protocol, Maximum Transmission Unit

OC9487303 Page
1 Oct 2018
0
And each layer above builds on top of it. Iff you can implement the functionality correctly and completely in a lower layer. Take the problem and break
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture 1: L1 9/29/18

OC9487301 Page
28 Sep 2018
0
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 26: Carrier-Sense Multiple Access, Media Access Control, Frequency-Division Multiple Access

OC9487303 Page
5 Dec 2018
0
Bridges - different than what we know about bridges! We learned that bridges were store-and-forward devices that speak the same layer. These bridges ar
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 9: Ipv4, Packet Loss, Checksum

OC9487302 Page
17 Oct 2018
0
Own addressing scheme (for routers to forward packets) E. g: fddi"s max packet is 4500 bytes while ethernet is 1500 bytes! Something might go wrong in
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 27: Source Routing, Hypertext Transfer Protocol, Tcp Tuning

OC9487305 Page
7 Dec 2018
0
| ethernet | ip | tcp | http | payload. Know the fields of each header, how to fragment, etc. Arbitrate which nodes can send frames at any point in tim
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 25: Ieee 802.3, Master Sergeant, Ieee 802.11

OC9487303 Page
3 Dec 2018
0
Even w/ csma there can still be collisions! Requires a minimum frame size ( acquiring the medium ) Ensures sender sticks around and listens long enough
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 24: Alohanet, Bit Rate, Frequency-Division Multiple Access

OC9487303 Page
28 Nov 2018
0
Need to share media w/ multiple nodes (n) Bitrate of the link is split across channels! No one sender cannot achieve full bit rate of the medium! Can o
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UCSDCSE 123Alex SnoerenFall

CSE 123 Lecture Notes - Lecture 23: Intersymbol Interference, Bandlimiting, Baud

OC9487303 Page
26 Nov 2018
0
For any bandlimited channel, it has a max freq f. Reality: you cannot change that freq very fast! (depends on how high it is!) Attempting to signal too
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