Questions tagged [subnet]

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

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Using a third router to bridge two subnets [closed]

I have some network savvy, but not a ton, and I haven't been able to find a simple and specific answer to this question, so thanks ahead of time for keeping specific and not assuming I know how to use,...
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subnetting to give 4 2000 adresses [duplicate]

A large number of consecutive IP addresses are available starting at 198.16.0.0/19. Suppose that four organizations, A, B, C, and D, request 2000, 2000, 2000, and 2000 addresses, respectively, and in ...
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2answers
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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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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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3answers
124 views

How is it possible for AWS to offer the same private network address to different customers?

I've been studying subnetting and of course there's plenty I'm confused about. One issue is as follows: my company uses AWS. For our VPC let's say we have a private network address of 10.2.0.0 /16 ...
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1answer
37 views

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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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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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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1answer
25 views

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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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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1answer
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Host IP address vs gateway IP address vs DHCP IP address

What is the difference between a host IP address, a gateway IP address, and a DHCP IP address when setting up networking devices? For example, when configuring a virtual network adapter for my VM, I ...
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1answer
21 views

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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1answer
20 views

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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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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613 views

how to make multiple subnet able to use one resource without being able to connect to each other in any way

i`m trying to connect multiple subnets to one web server but these subnets should not be able to connect to each other.i cant make any changes on these subnets. I just have a lan cable from each ...
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2answers
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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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1answer
43 views

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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832 views

Is it possible for 1 server to serve two different subnets?

I was wondering if it is possible for a server to serve two different subnets? I am new to networking so I'm getting confused. I am using Cisco packet tracer and would like to configure a web and ...
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Can't ping the management IP of Switch

My topology is: I am logged in to R1. I can ping 10.0.0.2 on R2 and 198.51.100.1 on R2, but can't ping the management IP of sw3 (198.51.100.2). What am I doing wrong? R1#sh ip arp Protocol Address ...
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2answers
328 views

Packet transfer from one host to another

I was reading about how a packet is send from one host to another. I am confused about entries that will be made in layer-3 switch routing table. Does it contain the entries for layer two switches or ...
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3answers
615 views

Subinterface in cisco router

Quick question - I was learning about subinterfaces and using Cisco Packet Tracer I wanted to create simple network with two computers (every in different networks (192.168.1.1/24 and 192.168.2.1/24 ...
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2answers
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Subnetting aggregation

I saw this example online . 192.168.12.0/23 applies the network mask 255.255.254.0 to the 192.168 network, starting at 192.168.12.0. This notation represents the address range 192.168.12.0 - ...
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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
121 views

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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4answers
143 views

Does a Business Router from an ISP perform actual routing or only Network Address Translation (NAT)?

Let's say that the professional business router is connected to the Internet through the WAN port and has some devices in the office connected through the other ports. The devices in the office ...
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3answers
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Why can't devices in different subnets talk with each other?

I know that the layer 2 doesn't understand IP, and the broadcast domain is same. Why can't devices talk, how does it happen?
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3answers
491 views

Two identical IPv4 adresses in different subnets

Is it possible to have two identical IP adresses in two different subnets such as PC1 and PC4?
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3answers
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Cisco 1921 Sub interface access to internet

I have set up a sub interface on Gi0/1 and I would like to provide access to the internet for devices on the VLAN that routes to Gi0/1.200. The devices pick up DHCP addressing just fine but cannot ...
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5answers
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Why do Vlans need routers to communicate?

Why do devices on two separate VLANs (Virtual LANs) implemented on the same switch require a router to communicate?
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1answer
287 views

Can computer device with multiple NIC be configured with same subnets for isolated networks? [closed]

Two Networks I have an embedded device using Xilinx ARM processor, with eth0 and eth1. I also have wlan0 and I am running Linux 3.17. PC0 <---left--->[eth0 ARM eth1]<---right:some ...
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1answer
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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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2answers
6k views

Routing Between 2 different vlans but same subnet

I have a basic doubt understanding vlan communication. Scenario: Let's say a single switch and has been configured with 2 vlans (vlan 100 and vlan 200). Vlan 100 connects to lets say 192.168.100.0 ...
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4answers
102 views

Multi LAN network does the main router to the internet need to be in its own subnet?

I have to design a network where there are 4 within which are different number of VLANs with varying number of hosts per VLAN depending on the building. My confusion lays in the main router, does it ...
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3answers
3k views

Why do routers have only a few interfaces?

Why do routers have only a few interfaces? Since one router interface is one subnet itself, a router given G0/0, G0/1 and G0/2 can only have three subnets. Is it sustainable? How can we go beyond ...
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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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What would happen to Ping if two PCs have same IP address with same Subnet Mask on same network?

If there are two PCs with same IP address on a LAN, what would happen if I ping that IP address from another PC on the same network and why?
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1answer
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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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4answers
316 views

Access a subnet through another network [closed]

We have some devices connected together through a switch. We need to access them through another network, but because of limitations in available IP addresses, we can't get an IP address from that ...
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1answer
3k views

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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