0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
How are VLANs and subnets related?
Although VLANs and subnets are quite different concepts, when using VLANs, there should be a one-to-one correspondence between the two. That is, every VLAN should be in a different subnet.Although VLANs and subnets are quite different concepts, when using VLANs, there should be a one-to-one correspondence between the two. That is, every VLAN should be in a different subnet.Although VLANs and subnets are quite different concepts, when using VLANs, there should be a one-to-one correspondence between the two. That is, every VLAN should be in a different subnet.Although VLANs and subnets are quite different concepts, when using VLANs, there should be a one-to-one correspondence between the two. That is, every VLAN should be in a different subnet.
What is a subnet in computer networks?
A portion of a network that shares a common address component. On TCP/IP networks, subnets are defined as all devices whose IP addresses have the same prefix. For example, all devices with IP addresses that start with 100.100.100. would be part of the same subnet. Dividing a network into subnets is useful for both security and performance reasons. IP networks are divided using a subnet mask.
Can you connect two computers directly with one cable without router?
Yes, the cable has to be a "cross-over", the subnets need to match, and the IP's need to be within the same subnet.
How to use 172.16.0.0 to create 32 subnets?
172.16.0.0 is really a B Class address with 16 network bits and 16 host bits, i.e. Network Address 172.16.0.0 has 255.5255.0.0 as Subnet mask in Classful Addressing. To create 32 (25) subnets we will use first five bits for Network part and will leave 3 bits as Host bits in third octet. Now Addressing will be:Network Address: 172.16.0.0\21 or 172.16.0.0 Subnet Mask: 255.255.248.0First two networks will be : (1) 172.16.0.0-172.16.7.255\21, (2) 172.16.8.0-172.16.15.255\21 and last two networks will be (1) 172.16.240.0-172.16.247.255\21, (2) 172.16.248.0-172.16.255.255\21.(Note to use Zero subnet - remember to use IP SUBNET ZERO command.)
A network uses a subnet mask of 255.255.255.0?
That could be a default subnet mask for a class C network.A mask used to determine what subnet an IP address belongs to. An IP address has two components, the network address and the host address. For example, consider the IP address 150.215.017.009. Assuming this is part of a Class B network, the first two numbers (150.215) represent the Class B network address, and the second two numbers (017.009) identify a particular host on this network.Subnetting enables the network administrator to further divide the host part of the address into two or more subnets. In this case, a part of the host address is reserved to identify the particular subnet.
Why first and last subnet cannot be used?
because these two subnet are reserve
When you break an iron magnet into two pieces you get what?
Two smaller magnets.
Is a default gateway required if you want to communicate on the LAN by IP addresses only?
A default gateway entry is only needed if the two computers are on different subnets. This is true whether you use IP addresses or have some sort of name resolution. The default gateway points to a router that routes packets between subnets.For instance:Computer 1 - 201.13.16.99, subnet mask 255.255.0.0Computer 2 - 199.27.12.43, subnet mask 255.255.0.0These two computers are on different subnets, and would require a router AND a default gateway entry pointing to that router to communicate.Computer 1 - 192.168.2.100, subnet mask 255.255.255.0Computer 2 - 192.168.2.67, subnet mask 255.255.255.0These two computers are on the same subnet, and will be able to communicate as long as they have a physical ethernet connection between the two. No default gateway entry or router is needed.The default gateway IP is never used by the TCP/IP stack unless a connection outside the local subnet is needed.Note that this has nothing to do with whether you use IP's or netbios names resolved by a WINS server or DNS names resolved by a DNS server. All these schemes eventually resolve down to an IP (and then to a MAC address for the actual communication) so the above still applies.
If you break a magnet do you get two smaller magnets?
Yes, you actually do get two smaller magnets, and each has a north and south pole.
What is the maximum number of subnets in class A using this mask of 255.255.192.0?
Ok good question To subnet any network requires borrowing host addresses The 255.255.192.0 regardless of class says host addresses start at CIDR (Classless Inter Domain Routing Protocol) /18. So if we borrow every available host address space then we have 2^14 = 16,384 possible subnet addresses available, NOT. In reality we have 11111111.11111111.11000000.00000000 or a /18 network. Every network / subnet requires two special reserved addresses. The network or zero address, and the last address in the range which will be assigned as the broadcast address. So we can't borrow all of the bits for sub netting. If we only leave one we will only have two addresses for the hosts, this won't work because we need to reserve two. We have to leave two so we will have 2^2 = 4. We can then give each subnet a network address and a broadcast address and still have 2 usable hosts' addresses. If we do this we only have 2^12 subnets = 4096. Each subnet will only have two usable host addresses and two reserved addresses. See the math confirms that 4096 * 4 = 16384 which is the total number of addresses in the address space we started with.
What device should be used to connect two subnets?
router
What IP addresses are subnetted A 139.233.12.12 255.255.255.0 B 10.0.0.1 255.255.255.0 C 192.168.0.1 255.255.255.0 D 190.233.17.3 255.255.255.0?
A, B and D are subnets. C is not. IP addresses A and D are both Class B subnets. Class B addresses normally have a subnet mask of 255.255.0.0. The first two bits of a class B network are always 10 which leaves 14 bits for the network prefix, thus allowing up to 16,384 separate Class B networks (including 139.233.0.0 and 190.233.0.0). The last 16 bits denote the host number thus there can be up to 65,536 hosts per network. By specifying a subnet mask of 255.255.255.0 the network can be divided into as many as 256 separate subnets each with 256 hosts. IP address B is a Class A subnet. Class A addresses normally have a subnet mask of 255.0.0.0. The first bit of a class A network is always 0, which leaves 7 bits for the network prefix, thus allowing up to 127 Class A networks (including 10.0.0.0). The last 24 bits denote the host number thus there can be up to 16,777,216 hosts per network. By specifying a subnet mask of 255.255.255.0, the hosts can be divided into as many as 65,536 separate subnets each with up to 256 hosts. IP address C is a Class C address, but is not a subnet. Class C addresses normally have a subnet mask of 255.255.255.0. The first three bits in a Class C network are always 110, leaving 21 bits for the network prefix, thus allowing up to 2,097,152 Class C networks (including 192.168.0.0). The last 8 bits denote the host number thus there can be up 256 hosts per network. To make a subnet out of a Class C address you must have a subnet mask of 255.255.255.X, where X may be 192, 224, 240, 248 or 252. That is, 2, 3, 4, 5 or 6 bits to denote the subnet and the remaining bits to denote the hosts. Thus a subnet mask of 255.255.255.192 would allow as many as 4 subnets each with up to 64 hosts, while a subnet mask of 255.255.255.240 would allow as many as 16 subnets each with up to 16 hosts. It should be noted that the maximum number of hosts is actually 2 less than the figures shown above. This is because the host address with all 0 bits is reserved for network address while the host address with all 1 bits is reserved for broadcasting.
