18 Questions
How many IP addresses are available in the pool to be assigned to other hosts in a DHCP server configured with 10.19.44.0/24 and 6 reserved for servers?
245
What is the prefix length notation for the subnet mask 255.255.255.224?
/27
A DHCP server is configured with 192.168.184.0/26, reserving 18 IP addresses for access points. How many IP addresses remain for other hosts?
57
What is the result of subnetting the 192.168.10.0/24 network with /26 masks in terms of the number of equal-sized subnets created?
4
If a DHCP server is configured with 172.23.143.0/26 and reserves 14 IP addresses for file servers, how many IP addresses are left for other hosts?
48
When troubleshooting network connectivity issues, what can be concluded if the 'show interfaces trunk' command reveals that VLAN 20 has not been created?
There is an issue with VLAN configuration.
How many usable IP addresses are available in the network 192.168.10.0/28?
14
If a network has a subnet mask of 255.255.255.240, how many host bits are used for subnetting?
4
Given a network address of 10.10.10.0/24, what is the broadcast address if subnetted with a /26 mask?
10.10.10.191
An organization needs to create subnets with at least 200 host addresses each. Which of the following subnet masks should be used?
255.255.255.224 (/27)
If a network has a subnet mask of 255.255.252.0, how many subnets can be created from the original network range?
16
An administrator decides to use a /30 subnet mask for point-to-point links in a network setup. How many usable IP addresses are there in each of these subnets?
2
Which subnet mask allows for 126 hosts on a single network?
255.255.255.240
Which of the following private address ranges is defined by RFC 1918?
172.16.0.0 - 172.31.255.255
Which address range is reserved for IPv4 multicast?
224.0.0.0 - 239.255.255.255
Which of these is a valid public address?
209.165.201.10
Why would a private IP address be unsuitable for a video conferencing scenario between two remote schools?
Private IP addresses cannot be routed over the Internet
Which subnet contains the address 172.16.64.255?
172.16.0.0/12
Study Notes
DHCP Address Pool and Reserved Addresses
- A DHCP server with an address pool of 10.3.2.0/24 reserves 3 IP addresses for printers, leaving 252 IP addresses available for other hosts.
- A DHCP server with an address pool of 172.23.143.0/26 reserves 14 IP addresses for file servers, leaving 58 IP addresses available for other hosts.
- A DHCP server with an address pool of 192.168.184.0/26 reserves 18 IP addresses for access points, leaving 46 IP addresses available for other hosts.
- A DHCP server with an address pool of 10.19.44.0/24 reserves 6 IP addresses for servers, leaving 248 IP addresses available for other hosts.
Subnet Masks and Prefix Lengths
- The prefix length notation for a subnet mask of 255.255.255.224 is /27.
- A network administrator subnets the 192.168.10.0/24 network with /26 masks, creating 4 equal-sized subnets.
Router Configuration and Troubleshooting
- The command "show interfaces trunk" can be used to troubleshoot issues with VLAN configurations.
- A router-on-a-stick configuration can be used to implement VLANs, but incorrect configuration can cause connectivity issues.
Subnetting and Host Addresses
- A network with a subnet mask of 255.255.252.0 has 1022 available host addresses.
- Subnetting the 192.168.1.0/24 network into 4 subnetworks results in the second usable subnet having an address of 192.168.1.64 and a subnet mask of 255.255.255.192.
Broadcast Addresses and Private Networks
- The broadcast address for the network 172.16.16.0/22 is 172.16.19.255.
- Private networks are defined by RFC 1918 and include the address blocks 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.
Subnet Masks and Host Requirements
- A subnet mask of 255.255.255.128 can accommodate 126 hosts.
- A subnet mask of 255.255.255.128 is required to accommodate 126 hosts.
IPv4 Addresses and VPNs
- The IP address 192.168.25.10 is a private IP address and cannot be used for communication over the Internet.
- IPv4 multicast addresses range from 224.0.0.0 to 239.255.255.255.
- Public IP addresses are not reserved for private networks or loopback addresses.
Test your knowledge of IPv4 addressing and subnetting with questions on private network address blocks defined by RFC 1918, subnet masks for accommodating a specific number of hosts, and more.
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