Network Segmentation
Subnetting
VLSM
Network Stuff
IPv6
100
How many broadcast domains are their?
A router is used to route traffic between different networks. Broadcast traffic is not permitted to cross the router and therefore will be contained within the respective subnets where it originated. Each active line connected into the Router is a Broadcast Domain.
100
What subnet mask would provide the maximum number of equal size subnets while providing enough host addresses for each subnet in the exhibit. The address block is 10.0.0.0 /8.
/26 would give you 62 usable hosts for each network.
100
Your company has a network address of 10.110.1.64 with a subnet mask of 255.255.255.128.
They want to create two subnetworks that would contain 28 hosts and 40 hosts.
What would be the Network addresses of each of these subnetworks be using VLSM?
Subnet 10.110.1.64 /26 has 6 bits that are allocated for host addresses and therefore will be able to support 64 addresses, but only 62 valid host IP addresses. Subnet 10.110.1.128/27 has 5 bits for host addresses and will be able to support 32 addresses, but only 30 valid host IP addresses.
100
With the network address of 10.10.1.0 and a subnet mask of 255.255.255.224 for all subnets, how many total host addresses are unused in the assigned subnets?
The network IP address 10.10.1.0 with a subnet mask of 255.255.255.224 provides 30 usable IP addresses for each subnet. Subnet A needs 12 host addresses. There are 18 addresses wasted. Subnet B uses 2 of the 30 available IP addresses, because it is a serial link. Consequently, it wastes 28 addresses. Likewise, subnet C wastes 28 addresses. Subnet D needs 23 addresses, so it wastes 7 addresses. The total wasted addresses are 18+28+28+7=81 addresses.
100
What is the Link Local IP?
FE80::1/60
FE80::2/60
200
What devices if connected together will increase the size of a broadcast domain?
When two or more switches are connected together, the size of the broadcast domain is increased and so is the number of collision domains.
200
What are the first, last and broadcast IP's of the 10.10.10.0 / 29 network for first 5 subnets...
Using a /29 prefix to subnet 10.10.10.0 results in subnets that increment by 8:
10.10.10.0 (1)
10.10.10.8 (2)
10.10.10.16 (3)
10.10.10.24 (4)
10.10.10.32 (5)
200
How many host are available for a 255.255.255.224, 255.255.255.128 and 255.255.255.252 subnets
200
Why would use use DHCP?
DHCP is generally the preferred method of assigning IP addresses to hosts on large networks because it reduces the burden on network support staff and virtually eliminates entry errors. However, DHCP itself does not discriminate between authorized and unauthorized devices and will assign configuration parameters to all requesting devices. DHCP servers are usually configured to assign addresses from a subnet range, so there is no guarantee that every device that needs an address will get one.
200
If you are given a group of IPV6 IP's how would you determine what the prefix-length would be?
All the addresses have the part 2001:0DB8:1234 in common. Each number or letter in the address represents 4 bits, so the prefix-length is /64.
300
Why would you create Subnets?
Reasons for creating subnets include reduction of overall network traffic and improvement of network performance. Subnets also allow an administrator to implement subnet-based security policies.
300
What is the formula to determine how many host IP addresses there are in a subnet?
If you are given a mask of /26 how many IP's would there be?
2n -2
Take 26 and write that out 26 1's in groups of 8 to make a subnet mask. Then add 0's for the remaining part of the subnet.
11111111.11111111.11111111.11000000.
0 = n in the above formula.
300
What type of IP address scheme would you want to assign to servers to make it easier to administrate?
When monitoring servers, a network administrator needs to be able to quickly identify them. Using a predictable static addressing scheme for these devices makes them easier to identify.
300
How many values can each Hex character represent?
One hexadecimal character can represent 16 different values 0 through F.
400
If you borrow 4 bits from the 255.255.255.0 subnet what would be your new subnet?
255.255.255.11110000 = 255.255.255.240
with 14 usable hosts per subnet.
400
How do you determine what part of an IPv6 address is the prefix or network portion?
The network portion, or prefix, of an IPv6 address is identified through the prefix length. A /64 prefix length indicates that the first 64 bits of the IPv6 address is the network portion.
If you IP is 2001:ACAD:1C5:B13::12AB:5CB the network portion would be 2001:ACAD:1C5:B13.
500
If you have 3 connected networks how many bits do you have to borrow to get a minimum of 3 subnets and what is the new subnet mask.
Use the formula 2n . You need to borrow 2 bits from the host portion.
255.255.255.192