Ch. 4.3 Flashcards
What is classless addressing?
IP Network and Subnet ID defined by Network Masks
What is classful addressing?
Allocates Network ID based on first octet of the IP Address
What are the Class A first octets?
How many max network addresses can there be?
1-126
126
What are the Public Class B first octets?
128-191
What are the Class C first octets?
How many max hosts can there be per address?
192-223
254 hosts per address
What is IP range 0.0.0.0/8 for?
0.0.0.8 means “This Network”
What is IP range 127.0.0.0/8 for?
127.0.0.0/8 is used for loopback addressing
What can a public IP address do?
Establish a connection with other Public networks and hosts over the Internet
Who governs the public IP addresses?
IANA
Internet Assigned Numbers Authority
What is the range of Class A private address range?
10.0.0.0 - 10.255.255.255
What is the range of Class B private address range?
172.16.0.0 - 172.31.255.255
What is the range of Class C private address range?
192.168.0.0 - 192.168.255.255
Can a router be configured with one IP or a block of public IP addresses?
Yes
What does NAT stand for?
What does NAT do?
Where is NAT used?
Network Address Translation
Translates between public and private IP’s
Used in Routers
Does a proxy server need or not need a public IP on the external-facing interface?
Need
What is is Class D IP Addressing used for?
What’s the range?
Multicasting
224.0.0.0 - 239.255.255.255
What range is 224.0.0.0 - 239.255.255.255 used for?
What Class letter is it?
Multicasting
D
What is is Class E IP Addressing used for?
What’s the range?
Experimental Use and Testing
240.0.0.0 through 255.255.255.255
What range is 240.0.0.0 through 255.255.255.255 used for?
What Class letter is it?
Experimental Use and Testing
E
What’s a loopback address used for?
What range is it?
Checks TCP/IP is correctly configured on local host
127.0.0.0 - 127.255.255.255
Does a loopback interface require a physical interface to function?
No
What is every IP host’s default loopback address?
127.0.0.1
What name is the loopback address associated with?
localhost
What is 0.0.0.0/8 typically used for?
A client seeking DHCP lease
What is 255.255.255.255 used for?
BROADCAST to local network when local network is not known
What are
192.0.2.0/24
198.51.100.0/24
203.0.113.0/24
used for?
Set aside for documentation and examples
What are factors to know when planning an IPv4 network addressing scheme? (4)
(Think simple)
Number of IP networks and subnetworks
Number of hosts per subnet
Network ID must be valid public/private range
Network ID must be unique on the internet
What 2 problems does Classless Addressing solve over Classful Addressing?
Class B addresses becoming scarce
Exponential growth in Internet routing tables
What does CIDR mean?
Classless Inter-Domain Routing
How does CIDR work? (2)
Route Aggregation (Supernetting)
Flexible Subnetting (VLSM)
What does VLSM stand for?
Variable Length Subnet Masking
What does VLSM do?
Allows network designer to allocate ranges of IP addresses to subnets that match the predicted need more closely
Right range for the right segment of the network!
