$.$ In Ethernet frame $-$ is used to synchronize receiver, sender clock rates:

A$.$ CRC

B$.$ Preamble

C$.$ Type

D$.$ Payload

$2.$ Ethernet$$s MAC protocol uses:

A$.$ unslotted CSMA$/$CA with binary backoffLink

B$.$ unslotted CSMA$/$CD with binary backoffLink

C$.$ slotted CSMA$/$CA with binary backoffLink

D$.$ slotted CSMA$/$CD with binary backoffLink

$3.$ Which error detection method involves the use of parity bits?

A$.$ Simple parity check

B$.$ Two$-$dimensional parity check

C$.$ CRC d$)($a$)$ and $($b$)$

D$.($a$),($b$),$ ad $($c$)$

$4.$ MAC address allocation administered by:

E$.$ A$.$ CIDER

F$.$ B$.$ ICANN

G$.$ C$.$ IEEE

H$.$ D$.$ NIST

$5.$ Consider the following multiple access protocols that we've studied: $(1)$ TDMA, and FDMA $(2)$ CSMA $(3)$ Aloha, and $(4)$ polling. Which of these protocols requires some form of centralized control to mediate channel access?

A$.$ Aloha

B$.$ CSMA and CSMA$/$CD

C$.$ Polling

D$.$ TDMA and FDMA