Life of a Packet

Question 1

DNS

Answer 1

Domain Name System:

Resolves a FQDN to an IP

Enterprises typically have an internal DNS server
If the internal server cannot resolve a query, it will be forwarded to a public DNS server

Question 2

ARP

Answer 2

Address Resolution Protocol:

Used to map an IP address to a MAC address

Question 3

Command: Allow router to resolve host names

Answer 3

ip domain-lookup

Question 4

Command: Set the DNS server to 172.23.4.1

Answer 4

ip name-server 172.23.4.1

Question 5

Command: Set a domain name

Answer 5

ip domain-name FlackboxA.lab

Question 6

Command: Add additional DNS suffixes to search

Answer 6

ip domain-list FlackboxB.lab

Question 7

Command: Make router act as DNS server

Answer 7

ip dns server

Question 8

Command: Assign host name LinuxA to 172.23.4.2

Answer 8

ip host LinuxA 172.23.4.2

Question 9

Command: View & Clear ARP Cache

Answer 9

show arp
(View ARP Cache)

clear arp-cache
(Clear ARP Cache)

Question 10

Host ARP Commands (Windows/Linux)

Answer 10

Windows:
View ARP Cache: arp -a
Clear ARP Cache: netsh interface ip delete arpcache

Linux:
View ARP Cache: arp -n
Clear ARP Cache: ip -s -s neigh flush all