N$2\mathrm{.}1.$ What is the promiscuous mode for?

N$2\mathrm{.}3.$ Why is the loopback interface called "loopback"?

N$2\mathrm{.}5.$ Why do we need the ARP protocol?

N$2\mathrm{.}6.$ A computer with the IP address $10\mathrm{.}8\mathrm{.}8\mathrm{.}5/24$ tries to ping $10\mathrm{.}8\mathrm{.}8\mathrm{.}8.$ An ARP

request will be sent out first. What are the values of the following fields in the Ethernet

header: $(1)$ destination MAC and $(2)$ source MAC?

N$2\mathrm{.}7.$ A computer with the IP address $10\mathrm{.}8\mathrm{.}8\mathrm{.}5/24$ tries to ping $10\mathrm{.}8\mathrm{.}8\mathrm{.}8.$ An ARP

request will be sent out first. What are the values of the following fields in the ARP

message: $(1)$ sender$\text{'}$s MAC, $(2)$ sender$\text{'}$s IP$,(3)$ target MAC, and $(4)$ target IP$?$

N$2\mathrm{.}8.$ A computer is on the $10\mathrm{.}8.\frac{8\mathrm{.}0}{24}$ network with the default router set to

$10\mathrm{.}8\mathrm{.}8\mathrm{.}1.$ It tries to ping $93\mathrm{.}184\mathrm{.}216\mathrm{.}34.$ Before the ping packet is sent out, an

ARP request will be sent out. What is the value of the target IP address field of the

ARP message?

N$2\mathrm{.}9.$ A computer with the IP address $10\mathrm{.}8\mathrm{.}8\mathrm{.}5/24$ tries to ping $10\mathrm{.}8\mathrm{.}8\mathrm{.}100,$ which

does not exist on the LAN. If another machine on the same LAN tries to sniff the ping

packet, will it be able to get the ping packet?

N$2\mathrm{.}10.$ A computer with the IP address $10\mathrm{.}8\mathrm{.}8\mathrm{.}5/24$ tries to ping $1\mathrm{.}2\mathrm{.}3\mathrm{.}4,$ which does

not exist on the Internet. If another machine on the $10\mathrm{.}8\mathrm{.}8\mathrm{.}0/24$ network tries to

sniff the ping packet, will it be able to get the ping packet?

N$2\mathrm{.}11.$ Please write a code snippet to spoof an ARP request message, with the goal of

poisoning the ARP cache of the machine $10\mathrm{.}8\mathrm{.}8\mathrm{.}5.$ Your attack machine is on the

same LAN.

N$2\mathrm{.}12.$ Please write a code snippet to spoof an ARP reply message, with the goal of poisoning

the ARP cache of the machine $10\mathrm{.}8\mathrm{.}8\mathrm{.}5.$ Your attack machine is on the same LAN.

N$2\mathrm{.}15.$ A news report says that company XYZ$\text{'}$s network was attacked by outsiders, who ap$-$

parently sent a lot of spoofed ARP requests$/$responses from remote machines to the

company's network, trying to launch ARP cache poisoning attacks. Please comment

on whether this is a fake news or not.