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CNE Final Exam Prep |Questions with 100% Correct Answers
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CNE Final Exam Prep |Questions with 100% Correct Answers
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CNE Final Exam Prep |Questions with100% Correct Answers
Purpose of EDC - ✔ ✔ Error detection and correction
Predominant method of error-detection in the link layer: - ✔ ✔ Checksums
One dimensional parity checks - even or odd bits
cyclic redundancy check (CRC) - XORs bits together, divides them with a known quantity,
an agreed upon value, 1011, and if that division ends with a remainder you know you have
an error
3 random access MAC protocols - ✔ ✔ Slotted Aloha, pure(unslotted) Aloha, CSMA/CD
Unslotted (pure) ALOHA - ✔ ✔ send data randomly tries again and again, until they don't collide
Slotted ALOHA - ✔ ✔ divides into discrete time intervals, only when there's an open
door (reduces collision by half)
CSMA - ✔ ✔ carrier sense multiple access, if busy don't send and wait, if idle send
CSMA/CD - ✔ ✔ collision detection, colliding transmissions aborted - polite conversationalist
Types of MAC protocols - ✔ ✔ Channel partitioning
Random access
Taking turns
, Channel partitioning - ✔ ✔ TDMA - time division
FDMA - frequency division
What are 3 drawbacks to "taking turns" MAC protocols. - ✔ ✔ Single failure point - one person
is in charge of who gets to talk. Collisions can still occur if control fails.
Scalability - the more people you have the slower things get, instead of 20 it's 100 people who
take a turn, 1000 even longer
Inefficient - only one person talking at once, lot of people waiting
What information is stored inside an ARP table in a router? - ✔ ✔ Address resolution protocol
MAC address, IP address, and Time to Live. The switch learns from the broadcast and
the messages sent and builds its own ARP table
What is the purpose and the process behind binary exponential backoff? - ✔ ✔ To prevent
the collision of packets when they're entering a network simultaneously. Creates a subset of
time that it will attempt to retry. Rather than just continuing, wait 1,3 or 5 seconds. Pick a
random number from the subset. If you wait for that long and still and can't get through you
make a bigger subset and try for the longer time.
Three Way Handshake - ✔ ✔ SYN, SYN/ACK, ACK
Types of Middleboxes - ✔ ✔ Firewalls, VPNs, etc
What is FDM and TDM - ✔ ✔ Divides information based on frequency, divides information
based on time
Guided vs Unguided Media - ✔ ✔ Guided: data transfer through physical media,
wired, connected physically
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