18 Questions
What is the main difference between Class A, B, and C IP addresses?
The size of the network ID
What is the purpose of a subnet?
To divide a network into smaller parts
What is the significance of the IP address 255.255.255.255?
It is a reserved “all ones” broadcast address
What is the range of IP addresses for Class A?
1 to 126
What is the main characteristic of Class D and E IP addresses?
They are used for special purposes
What is the purpose of the Network ID and Host ID?
To identify the network and the device on it
Devices with interfaces having the same subnet part of IP addresses can physically reach each other without an intervening ___.
router
What is the purpose of ICMP in the Network Layer?
Error reporting and network-level information
What does CIDR stand for?
Classless InterDomain Routing
How many subnets are present in the network?
3
What is the format of an IP address in CIDR notation?
a.b.c.d/x
What is the purpose of the 'ping' command?
To test network connectivity
What is the primary purpose of a subnet mask?
To describe which portion of an address refers to the subnet and which part refers to the host.
What is the typical number of interfaces a host has?
One interface
What is the purpose of an IP address?
To assign a unique ID to a host or interface in a network.
What is a subnet in the context of IP addressing?
A portion of a network that shares a particular subnet address.
How many bits are used to represent an IP address?
32 bits
What is the term for a connection between a host/router and a physical link?
Interface
Study Notes
IP Addressing and Subnets
- IP address: a 32-bit identifier for a host or router interface.
- Interface: a network connection between a host/router and a physical link.
- IP addresses are associated with each interface.
Subnetting
- A subnet is a portion of a network that shares a particular subnet address.
- Devices with interfaces on the same subnet can physically reach each other without an intervening router.
Subnet Mask
- A 32-bit combination used to describe which portion of an IP address refers to the subnet and which part refers to the host.
CIDR (Classless InterDomain Routing)
- A way of assigning IP addresses with a subnet portion of arbitrary length.
- Address format: a.b.c.d/x, where x is the number of bits in the subnet portion of the address.
ICMP (Internet Control Message Protocol)
- Used by hosts and routers to communicate network-level information.
- Error reporting: unreachable host, network, port, or protocol.
- Echo request/reply (used by ping).
IP Address Classes
- Classes A, B, and C are used for regular unicast addresses, each with a different dividing point between the Network ID and Host ID.
- Classes D and E are special and not divided in this manner.
Reserved IP Addresses
- IP addresses with special meaning, such as 255.255.255.255 (reserved "all ones" broadcast address).
- 127 is the network containing the IP loopback address.
IP Address Structure
- IP address: subnet part (high order bits) and host part (low order bits).
Test your knowledge on IP Addressing and Subnets with this quiz based on Computer Networking: A Top Down Approach, 7th edition. Topics include IP addresses, subnets, and subnet masks.
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