Questions tagged [subnet]

Questions relating to IP subnetting, including planning, calculation and best practices.

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Why does ARP request not use a router instead of broadcast?

Why in ARP request does the source computer broadcast a message with the destination IP address to find the MAC address of the destination computer? Why doesn't it send the message to the default gate ...
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1answer
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Can a subnet use more than one default gateway address?

This follows another question i had previously asked.. I am in a situation where sub net A is connected to two routers {Router A{left}} and {routerB{right}}. The sub net A knows that the address of ...
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Subnet a network and configure ripv1 [duplicate]

Subnet 172.10.2.0/24 into 4 subnets with equal number of hosts and configure RIPv1. This ques came in my exam, can someone please tell, how do I subnet this. P.S. It would be helpful if you used a ...
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Two networks with two different subnetmasks

This may be a dumb question but I really don't get it. Let's assume we have two networks. Network A and B. They have the following devices: Network A Device X (IP: 192.168.0.10; subnet mask: 255.255....
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Communication between subnets on Sonicwall firewall

I have a Sonicwall TZ-350. X0 is the default LAN with IP 192.168.10.1, and X1 is the WAN. I've set up a second local subnet on X2 with IP 192.168.20.1 for a single NAS device (no switch; the device is ...
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How does RIRs actually ensure IP ranges ownership

I'm currently learning about CIDR, subnets and IPv4 classes. I understood that IPv4 classes were used to route traffic in the beginning but nowadays we use "dynamic" subnet masks with the ...
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How do i know which subnet mask should i use for an ip address of 135.135 [duplicate]

If i have to make two separate subnets for two different users like one for teacher and one for the students
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Need help with finding range of 120 subnets [duplicate]

i'm trying to find out the subnet address and broadcast address of subnet no 120. I know that for example if my subnet 1 address is 120.0.64.0 then i just need to keep adding 64, which is e.g 64 + 64 ...
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Could someone please clarify my understanding of this question? [duplicate]

I have been asked to use a particular IP address for a homework lab. The IP address is 218.179.169.7 and I have been asked to create 24 subnets and use the 16th network address. I dont fully ...
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What is the first and last address of a subnet? Is it the Network/Broadcast or the First/Last usable address? [duplicate]

For a computer science exam the question was: Find the first and last address of the subnet containing XXX.XXX.XX.XX/XX I put the network and broadcast address and got it wrong. Those who put the ...
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Divide IPv4 network into subnets in a SPECIFIC order [duplicate]

My private addresses start at 10.10.0.0/16. I must make 2 subnets with 120 and 450 starting with the 120 one and not leaving any unnecessarily unused addresses. Let me remark, it's IMPERATIVE that the ...
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Subnet Mask, Subnet address, Host Address [duplicate]

Given the subnet mask 255.255.248.0, how many bits are used for the subnet address, and how many bits are for host address? Also, I cannot figure out what is the subnet broadcast address if one ...
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Benefits of subnets in networks with externally hosted services

I'm a computer science teacher trying to understand the benefits of subnets. I understand how subnets are defined and how it can be determined using a subnet mask whether two hosts are on the same ...
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What exactly defines a LAN? [duplicate]

I'm trying to understand what exactly defines a Local Area Network as such? This is how Wikipedia defines a LAN, and that sort of how it's defined anywhere else I found: A local area network (LAN) is ...
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A question from an online subnetting quiz [duplicate]

Does anyone know the last usable host IP address for the 172.45.120.0/23 network? And an explanation of how you got the answer? It's a multiple choice question on an online subnetting quiz. I'm ...
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1answer
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Why is my assignment asking me use 172.16.0.0 private addressing and IPv4 sub netted Class C address Scheme?

I am doing a project for Cybersecurity and trying to build a college campus network. The complete instructions read: LAN infrastructure layouts for all campuses. • Represent multiple building/...
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Connecting industrial devices to OPC server while keeping segregation [closed]

We have two industrial machines (let's call them Holding and Media) with configured network addresses 192.169.0.122 and 192.169.0.123 respectively. Currently they are isolated physically although ...
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directed broadcast ping on overlapping subnets

I have a router with 2 hosts connected to it. R: 192.168.0.1/24 host 1: 192.168.0.9/28 host 2: 192.168.0.15/24 Host 1's directed broadcast IP is the same as host 2, so what happens if host 1 pings 192....
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Dividing Network into Subnets [duplicate]

Divide the network 172.16.0.0/22 ​​into subnets of the following size: 128, 300, 40, 20, 20. How exactly is this done?
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Recommended IPv6 prefix size for PPP to a single host?

I am using PPP to create a IPv6 connection to a remote host. What is the recommended IPv6 prefix size for a single host at the other end of the PPP connection? Should it be /128, because there is ...
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1answer
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Does every link between routers demand a new subnet?

This might be a stupid question but I'm new to this. I am studying a class about basics of networking and I don't really understand one question that we have. We need to a divide the given IPv4 ...
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Transfer subnet needed between Firewall and Routing Switch?

When looking at the image, the Switch is routing capable (L3) and is the default gateway for clients in the LAN. We plan to introduce a new Firewall and stand before the question if we should give its ...
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In gnss3, why can't I ping my cisco router from my VM?

I have the following network, I have never configured a Cisco router before so I'm having a little trouble. In router R1 I used the following commands to assign an ip to the router: configure terminal ...
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What is the use of a host mask/ wildcard with respect to subnetting and ranges? [duplicate]

Taking the example of 10.0.0.0/20, that means my range is 10.0.0.0 to 10.0.15.255 I got that range because I know that the wild card is 0.0.15.255 and I just add it with the beginning address 10.0.0....
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1answer
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Why does this ip address give me an error “must be valid ipv4 cidr”?

If I set up an AWS VPC with CIDR of 10.0.0.0/20 then the range is 10.0.0.0 to 10.0.15.255 I make a subnet now. Why does 10.0.15.15/28 give an error. Isn't it's range 10.0.15.15 to 10.0.15.30 which is ...
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“Destination host unreachable” when pinging a pc from another network

I tried to build a simple network in Packet Tracer and I get "Destination host unreachable" when I try pinging a PC from another network. Pinging PCs from the same network works. When I use ...
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Confused in what maximum number of hosts and maximum number of subnets mean [duplicate]

Given a 172.12.0.0 /16 to be subnetted to appropriate networks. Branch 1 has 80 hosts, Branch 2 has 31 hosts and Branch 3 has 75 hosts. I've already made a subnet table based on these using VLSM: ...
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Do subnets need a router between them to communicate or can multiple subnets communicate from within the same router?

Well, it's just as the question states, Do subnets need a router between them to communicate or can multiple subnets communicate from within the same router?
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How many hosts can I have on a class C network [duplicate]

Please bare with me, I'm a complete newb to networking and I'm going to try and explain my doubts to the best of my abilities. So, to start off, I know that classful networks aren't a thing anymore ...
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How to find the first and last address in the FIRST AND LAST SUBNET [duplicate]

So there's a problem that literally stress me out every time I look at it. It's like I almost understand it until I get to knowing how to find the first and last host in the LAST address (last subnet)....
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network question [duplicate]

can someone please explain this question and answer Based on networks 10.8.16.0/22 and 10.8.31.0/21, which of the following is the BEST summarized CIDR notation? A. 10.8.0.0/16 B. 10.8.0.0/19 C. 10.8....
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IP address, network ID, host ID and subnet ID [duplicate]

I am studying a course about computer networking and again I stumbled upon a section that raised a question. I found very helpful people in this forum and I hope you can help me once again. During the ...
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Why is it called a “subnet mask” and not just a “network mask”? [duplicate]

Let's say I have a private home network of 192.168.1.0 that is capable of containing 254 hosts. In this case, the configured subnet mask "255.255.255.0". This conveys that the network ID is &...
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Why does sub-netting not give us more addresses? [duplicate]

Sorry if this is dumb, but I am very knew to learning about networks. Here is my reasoning? Let's take the address, 24.50.12.4 if we subnet it with /16 then the network address is 24.50 + host is 0.0....
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Routing between completely separate private networks

I’ve got a request from a partner vendor in a completely separate routing domain to directly route a /24 rfc1918 network on my rfc1918 internal network. The proposed solution has their handoff ...
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Is 12.23.34.45/24 a valid IPv4 subnet definition? [duplicate]

I believe the question says it all: when referring to an IPv4 subnet, is it valid to use 12.23.34.45/24? If it is, is it equivalent to 12.23.34.0/24? If it is not, can you refer me to helpful ...
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difference between network address and subnet address [duplicate]

Now this question seems a bit childish to ask, but since i am new to networking, so i think i should ask the question here. while studying about subnetting, i was trying to understand a subnet mask, ...
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1answer
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ASSIGNED or AGGREGATED-BY-LIR status of IPv6 subnet used for Virtualisation

According to the RIPE NCC IPv6 Basics training slides the ASSIGNED status should be used for your own infrastructure and individual (large) assignments to customers. The AGGREGATED-BY-LIR status ...
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1answer
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Can i/how discover subnet CIDR from IP range? [duplicate]

i have found the IP range 120.76.0.0 - 120.79.255.255 that i want to ban in iptables the way i write x.x.x.x/xx format. Please how to know what that x.x.x.x/xx should be? I have found some online tool ...
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How to select CIDR blocks when subdividing a network? [duplicate]

I saw these two questions, but they are still too over my head and start too far along the path: How to divide network into subnets? How do you calculate the prefix, network, subnet, and host numbers?...
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1answer
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Is it possible to know the mother address of a subnet?

The mother address is X, have Y numbers of subnets (children), we already know 2 of the mother's children, they're: 10.1.192.0 /20 [edited] 10.1.240.0 /20 Is it possible to know the value of X and Y ...
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1answer
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What are some techniques to infer the subnet being used? [closed]

Given a list of thousands of IPv4 addresses and that you have no direct access to these hosts, is there a service or a methodology to infer a subnet that's possibly being used?
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Basic Subletting 10.239.142.216/11 [duplicate]

First time poster (kindly don't eat me alive) i was using https://subnetipv4.com/ to acid test my subletting skill i got 9/10 correct this is the chosen one that broke my streak as you can see i ...
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different network mask and subnet mask and netmask [duplicate]

1- what is network mask? 2- what is subnet mask? is there any differnt between network mask and subnet mask? i'm tried to search about network mask and nothing found is it called netmask ? thank you
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32 bits or 30 bits for subnet mask

I'm new to networking and have a question about subnet masks. Imagine we have a class B IP address. I know how to calculate the subnet mask. My question is: What is the last subnet mask that we can ...
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2answers
139 views

Network topology for merging two different layer 2 networks

I have a scenario, (shown in attach diagram) where i need to merge traffic from two server 1 , 2 to target server 3. All three are on different vlans/subnets. With layer 3 switch in between would it ...
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1answer
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what were the classless routing protocols used with VLSM when it was first introduced?

Since VSLM is supported only by classless routing protocols, if VSLM was introduced in 1987(RFC 1009) and all classless protocol(RIPv2 developed in 1993 , OSPF standardized in 1989 RFC 1131 ) cited ...
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Can a Subnet have more than one CIDR range?

For many years I thought of a subnet as a single contiguous range of ip addresses expressed using CIDR notation. However on GCP a subnet can have a primary ip address range from which VMs get ...
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IPs that don't have subnet mask

I'm new to networking. I know that some IPs don't have a sub net mask like 127.0.0.1 and the range that starts with 127. I wanted to know if there is any other IPs that don't have sub net mask.
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Two routers on the same subnet - Possible issues?

What issues can occur when two routers are set to the same subnet (no cascading, both cable connected to the same switch)? For instance: - LAN: 192.168.1.0/24 - Router A: 192.168.1.254 - No DHCP, ...

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