Subnetting - How To Calculate Network Address
Jan 11, 2012
Given the IP address of 172.16.10.22 and the network mask of 255.255.255.240... answer the following:
What is the network address?
What is the broadcast address?
What is the valid host IP range?
What I have done so far:
Part 1 - Broadcast address
172.16.10.22 - 10101100.00010000.00001010.00010110
255.255.255.240 - 11111111.11111111.11111111.11110000
Researching different ways to find the Broadcast address I took the binary IP address and replaced all numbers with 1's for the host bits identified in the subnet mask and came up with:
172.16.10.31 - 10101100.00010000.00001010.00011111
Is that the correct Broadcast address?
Part 2 - Network address
I am not sure what is meant by the network address and all my research has come up with either MAC addresses (obviously wrong) or CIDR notation...How do I calculate the network address?
Part 3 - List of valid IP's
Using the same address 172.16.10.22/28 I did the following:
28 is closest to 32 (block wise) so 32 - 28 = 4... 2 ^ 4 = 16 (block size)
IP address listing:
172.16.0.0
172.16.16.0
172.16.32.0
172.16.48.0
172.16.64.0
and so on...
The IP address in question is 172.16.10.22 and falls in the 172.16.0.0 - 172.16.15.0 block...
Is this the correct list of valid IPs?
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Dec 13, 2011
I am looking a old exercise I did last year about subnetting and I am wondering if is possible to subnet:
198.18.9.1 /22
I wrote down, last year, that:
16 bit are assigned to network
6 to subnet
10 to hosts
when actually I see a class C ip address with 10 bit assigned to hosts. So, how many bit do I have for network, subnet and hosts?
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Apr 27, 2012
How can know the Broadcast address before subnetting? I know how to calculate the broadcast address , but don't understand 'Broadcast address before subnetting'?
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Jun 18, 2012
I am in the process of acquiring a static ip address from my isp time Warner. I only want to pay for a single static, but I have a number of machines I want to put on the internet, a web server and a e-mail-server. Using a cisco router, a Cisco Rv 120w. Can I assign the static ip address my isp gave me to the Rv 120w and then crate a vlan to assign addresses to various computers. Or is this something my ISP does. I get the impression from the tech guy at Time Warner that this is something they do.
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Apr 10, 2012
I wanna subnet my Network to increased performanced but im alil confused hereWhen looking at my ROUTER STATUS this is what i have.
INTERNET PORT
IP Address XX.XX.XXX.XX
gateway ip XX.XX.X.X
XX.XXX.XXX.XX
LAN PORT
ip address xxx.xxx.x.x
Which one of this ip addresses do i have to subbnet?,my router is a ,NETGEAR N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700 Wireless router - 4-port switch (integrated) - EN, Fast EN, Gigabit EN, IEEE 802.11b, IEEE 802.11a, IEEE 802.11g, IEEE 802.11n.
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Feb 2, 2012
I want to measure the the ospf convergence time on the given network topology (assume 5 nodes - partial mesh topology).I am using quagga software as routing software on linux box. Quagga is runnign fine and network is converged, able to see all the routes.. Quagga software is logging all the osfp information includign packets,state machines,etc.I am going to disconnect a link between node a to node b. and i want to measure the convergence time of the network.What is the network convergence time?My answer is, The time taken to reflect the topology change (link down/up, network condition change) to all the routers on the topology.Some routers(close by routers to the topology change) will get converged fast, and some routers(far away from the topology change) will have the higher convergence time. we have to take the highest convergence time of the router on the topology and we can says thats the ospf network convergence time.
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Dec 8, 2012
I am currently trying to understand Subnetting via CCNA. My progress is going well,I understand the class below:
Class A 0-127 Max IP 2^24 = 16777216
Class B 128-191 Max IP 2^16 = 65536
Class C 192-223 Max IP 2^8 = 256
However I have seen an example from an ip calculator website, and noticed this :
Address: 192.168.1.0 11000000.10101000 .00000001.00000000
Netmask: 255.255.0.0 = 16 11111111.11111111 .00000000.00000000
Wildcard: 0.0.255.255 00000000.00000000 .11111111.11111111
=>
Network: 192.168.0.0/16 11000000.10101000 .00000000.00000000 (Class C) - I would have thought this would have been Class B?
Broadcast: 192.168.255.255 11000000.10101000 .11111111.11111111
HostMin: 192.168.0.1 11000000.10101000 .00000000.00000001
HostMax: 192.168.255.254 11000000.10101000 .11111111.11111110
Hosts/Net: 65534 (Private Internet)
Is this an invalid IP/masks as the max hosts is 65534 (which should be class B?). If so shouldnt the IP address range from 128-191- eg 172.16 (I know that CIDR is the amount of 1's. ).What calculates the class is it the netmask or the range of the first octet?
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how do i know someone is connected to my wireless
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Feb 29, 2012
Why isn't it possible to make following configuration:
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Jun 1, 2011
you can subnet to meet the number of networks required, or you can subnet to meet the number of hosts required. In which circumstances would you use either one? or are they both the same? am kinda confused.Is subnetting according to the number of hosts VLSM? and subnetting according to the number of networks required is not VLSM subnetting? Also I'm on CCNA 1 chapter 6, if the other CCNA 2, 3 and 4 has chapters explaining subnetting better cos It's totally confusing me atm.Also, is my understanding correct, when a company wants a LAN made, a network designer see's how many hosts they require in each of their LANS and then chooses an appropriate address class and subnets it? and to connect the LAN to the internet he implements NAT on the router that connects to the internet, and that router translates the internal addressing scheme that was created into a public registered IP address from an ISP? Also does he just make the address up? for example if he decides to use class C, he just picks any random number in the class C range and subnets it?
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Apr 5, 2012
we currently use the ASA 5505 router. We would like to create another subnet inside our LAN because we are running out of IP addresses.
current subnet info:
subnet:10.1.1.X
submark: 255.255.255.0
gateway: 10.1.1.251
we want to make another subnet, which we plan to use for all our network printers for now( other use in the future) PCs at 10.1.1.X will be able to print on the new subnet. the new subnet will be able to connect to the internet.
What's the best options we can do for the subneting? how can we configure the router? is possible to set another DHCP on the new subnet. we currently have one DHCP on the 10.1.1.X
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Aug 7, 2012
I'm having some issues calculating CIDR notation, I'm just not able to get a solid grasp on it. [URL] but I'm not seeing how to calculate it. how to calculate it?
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Sep 16, 2012
I have a slew of 106001 messages coming into ASA log, from the outside interface. it appears like most of them are for standard traffic, such as TCP 80/443. i suspect these messages are from clients on the inside who have initiated connections to the internet, but then the client abruptly terminates application of something similar. Server side finally issues a close connection, reset or something else. Here is an example, with the ASA address being 1.1.1.195 (changed to protect the innocent ).
Another theory is that the NAT ip for clients is different than the actual interface IP, so that is behaving differently. For example, once the xlate times out, the IP used for the xlate is no longer active and any return packets to the interface would also error out - be refused. If the xlate was using the interface IP, that it would always respond in some way?
I can bump 106001 down to notification (5) or informational (6) level.
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- Fragmentation and reassembly needs to break a data-gram into an almost random number of pieces that later can reassembled.
- It uses the identification field to ensure that fragments of different datagrams are not mixed.
- IP packet of 1500 bytes comprises 1480 bytes of data and a 20-byte header.
- In the first intermediate network, the packet size of 1024 bytes allows for 1000 bytes of data plus a 20-byte IP
header.[code]
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Jul 13, 2012
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What exactly can I do during non-business to test to see what the bandwidth is between the 2 locations? Is there some type of command that I can run on the router to test this?
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May 20, 2012
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I then decided to look a bit further into it and went ito CMD and flushed the DNS. i then did 'ipconfig /release' which generated the response 'IP address for adapter wireless connection 9 has allready been released'. I then did 'ipconfig /renew' to which it generated an interestin response:
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Oct 9, 2012
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Feb 6, 2012
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I can install the printer to the Toshiba and it 'knows' the IP address to connect using a standard TCP/IP port that is installed in Printer ports. The printer installs fine and I ca nsend print jobs to the printer but they do not print. Eventually an error message comes up saying the job was not sent to the printer.
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