TCP/IP, Fortinet, DNS, DHCP Flashcards
What happens if the LT expires with no response from any DHCP Server.
- Client’s IP Released
- All TCP/IP Communications cease
- Only DHCP DISCOVER broadcasts are allowed.
What does DORA stand for?
Discover, Offer, Request, Acknowledge
What is the difference between TCP and UDP?
TCP is Connection-oritented
UDP is connectionless
What is Nmap used for?
Using arbitrary TCP and UDP traffic for the purpose of network tests.
When will the client request a Lease RENEWAL
LT/2 and LT 7/8 (87.5%)
All the types of DNS records
A, AAAA, MX, PTR, TXT, NS, SOA, SRV, ALIAS, CNAME
What does DNS do?
Returns various records about Domain- and Host- names, including IP Addresses
What are two things that can Terminate a DHCP Lease?
Manual Operation from the User, Automatic operation from the Client when shutting down
What is Nslookup used for?
Getting DNS records
When does a Client request a REBIND?
When the Server isn’t available after the second RENEW request, LT 7/8
What is a DHCP Lease?
It is a temporary Client IP address.
What are the four Domain Server Types?
Root Domain, Top Level Domain Server, Authoritative Server and Recursive Server
What is a Lease RENEWAL?
Renewal is a request sent to an already-connected server.
What should you call two computers making a connection with each other?
Alice and Bob
What is a Lease REBIND?
When a Server doesn’t acknowledge a RENEWAL Request, the Client sends a BROADCAST to the network.
What does OSI stand for?
Open Systems Interconnection
What Layer do routers work on?
Network
What layer do switches work on?
Data Link
What does ARP stand for?
Address Resolution Protocol
What does ARP do?
Connects an IP address to a device and a device to an IP Address
What Layer is ARP?
Data Link
How is a MAC address represented?
12 digit hexadecimal number (6-byte binary number), mostly represented by two digits separated by a colon
Google Public DNS Server IP
8.8.8.8
What layer do TCP and UDP operate on?
Transport
What layer are Routers on?
Network
What layer are switches on?
Data Link
What Layer is IP implemented?
Network
When does DNS use TCP?
For long messages.
What Layer is DNS?
Application
What kind of record does a reverse lookup return?
PTR, Pointer
