Questions tagged [networking]

For questions about networking in general. Any question about all on topic network devices can use this tag.

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VPN Connection between different campuses [closed]

Currently I'm working on a company that have four campuses, each one with their own network and I need to make sure that every single of them have internet with good speed. I stay on the main one and ...
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High ping in local network [closed]

When WIFI User client ping to routerboard ping is getting higher at sometime in localarea time=50ms-70ms. It should get low ms How to fix this issue. Is it affect to my internet speed ? i have 200 ...
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Safest way to set up IDS/IPS on home network and difference between capturing packets and port mirroring? [closed]

So I ha So I have been reading up a little bit on IDS/IPS systems and was curious about a few things. First, what is the difference between just setting up a PC and putting its wireless card in ...
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1answer
1k views

Does an unmanaged switch deal with IP addresses at all

My belief is that an unmanaged plug-and-play layer 2 network switch only deals with MAC addresses. When computer A on a local network wants to communicate with computer B for example through the ...
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5answers
798 views

Different Behaviour of a Router

There are 2 cases that I would like to point out: When the router is directly connected with 2 PCs like this, In this case, PC2 is able to ping PC3. I just configured the IP address of PC2 and PC3 ...
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1answer
73 views

Is this network configuration possible with Layer 3 switch and ISP routers?

If possible I would like to use a Cisco SF350-24 Layer 3 switch to enable the below network layout. In our office we have 2 internet connections we often use for testing that require an internet ...
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1answer
23 views

How networking secures the connection between Certificate authority and Client? [closed]

I know HTTPS is based on the Certificate authority (CA). If a client tries to send a request to a server (Assuming there is a Certificate), is it possible that a middleman can take the certificate ...
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0answers
49 views

Storm control problem with Juniper switch configuration (EX2300)

I am new with Juniper and generally new with switch configuration. Probably screwed up a lot but anyways, I will share my configuration right after I say what I want. I am getting Internet on ...
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1answer
34 views

Connect AP to Fortinet

I'm very new to Firewalls. Internet to my servers goes through a Fortinet Firewall. I wanted to add a wifi connection for other users as well, so I connected a NetGear Router as Access Point and gets ...
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1answer
514 views

Do you need SFP on both ends?

Can I have an SFP port with a RJ45/ethernet transceiver on one end and connect the other end to a regular ethernet port?
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2answers
65 views

Do segments at the transport layer contain IP information?

I have few questions about how UDP segments at the transport layer works. I read that The transport layer encapsulates the application layer data along with destination IP and destination port ...
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2answers
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HDLC issue with understanding real life application

Trying to understand how hdlc works based on this topology that I created to better visualise my question: I've been reading the Chapter 3 of Wendel Odom book, but not understanding the purpose of ...
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1answer
47 views

What is the reason behind not returning unused IP addresses? [closed]

There are several companies out there with one or more /8 IP addresses, for example: DoD has more than 200 million, HP has one /8 (>16 million), Apple has one /8, General Electric has one /8, IBM ...
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1answer
20 views

Is fiber to computer(without the use of any other cables in between) possible?? Are any further developments getting carried out towards this goal? [closed]

All of us know well that the fiber to home(FTTH) connections are a trend nowadays. Every nation is planning to replace the existing metal wires with optical fiber cables. But we also see that the ...
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14 views

Really new to Networking and wondering how the first 3 octets of 255 is 1 network [duplicate]

Watching this video on subnetting and I am kind of confused as to why the first 3 octets are all counted as one network but the last octet only adding 1 bit to it makes another network entierly. I'm ...
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1answer
48 views

Does a router work both on Layer 2 and Layer 3? [duplicate]

According to TCP/IP model router works at Layer 3. But when data has to be transmitted to different network it is based on IP address but hop-to-hop transmission is based on MAC address. That means ...
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0answers
17 views

If you create 20 equal length subnets from the network 192.168.10.0 what is the network address of the last subnet? [duplicate]

Note: Last subnet means last of how many you created. It may not be the 20th subnet.
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2answers
64 views

network IP packet format

i completely understand that why receiver there is 576 bytes but my question is as technology update every after one Minutes then why we can't update that limit [enter link description here][1]
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1answer
71 views

Is really TCP takes 3*RTT time to make a connection?

TCP takes 3 RTT time I have read from one stack overflow answer to make a connection with server. We know that TCP takes triple (Syn, Syn/Ack, Ack) to make a connection by 3-way handshake with server....
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2answers
82 views

Connecting switches in daisy chain / ring

I have a network of 15 switches which are all connected together throughout a building (1 per floor) via daisy chain configuration. There is one cat-6 wire between each switch. All switches have ...
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1answer
932 views

What does it mean to “plumb” an IP address?

Plumbing an IP address means what? What are some examples of it?
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21 views

What is the significance of subnets in a network interface? [duplicate]

I am struggling to understand how subnets are used in interfaces (ie. virtual interfaces in Linux) I am not asking how subnets are calculated. An interface has an IP address, but it also has a netmask ...
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2answers
159 views

How is P actually chosen in P-persistent CSMA?

I am struggling to understand how the probability value P is chosen for P-persistent CSMA for any particular station, what's the logic behind this.I have read from Wikipedia . P-persistent This ...
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2answers
92 views

Why client will send a RESET when it is closed state?

Suppose I have an TCP state transition diagram. And assume that the last ACK is lost. Then, B will think that A did not receive the FIN and will retransmit the FIN. From B point of view this is the ...
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2answers
362 views

In tunneling, how destination routers identify if a packet is encapsulated?

In tunneling, a packet gets encapsulated in the payload section of another packet. If the router at one end encapsulates the packet, then how the router at another end identifies whether the packet is ...
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1answer
90 views

Are IPv4 type of service and IPv6 traffic class equivalent to each other or is traffic class IPv6 specific? [duplicate]

IPv6 has a traffic class field. According to the specification it is an IPv6 length, out of which first 6 bits are called code point or differential services code point (DSCP) and the last 2 bits are ...
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1answer
104 views

How to tell if an ipv4 address is public or private?

I've read the below thing, in a website. According to standards set forth in Internet Engineering Task Force (IETF) document RFC-1918 , the following IPv4 address ranges are reserved by the IANA for ...
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2answers
1k views

How is UDP used in multimedia system inspite of being connectionless

We know that UDP does not care about segment (packet) in-order and their arrival on the destination.Then how on YouTube or VoIP (skype) are we able to stream videos? If a packets is lost (doesn't ...
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1answer
31 views

How a socks proxy is different from a normal proxy? [closed]

Socks is a protocol that a proxy uses, then it's called socks proxy. A normal proxy may use any other protocol. How a socks proxy is different from other proxies. What are all the unique features of ...
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1answer
38 views

What's the procedure to limit a subnet on a Cisco router from seeing another subnet when both are using NAT?

I have a Cisco 891F router. The internet is hooked up to G8. The student network is Vlan 200, and the Office is Vlan 100. (I know the internet has an internal subnet (192.168.1.5), but that's because ...
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1answer
34 views

IPv4 entries L3 switch

I am preparing the spec for L3 switch. I decided to buy the C9300L series switch, but I found out that the C9300L series has no IPv4 routing table entries. What does that mean? What is the impact of ...
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0answers
20 views

What is preamble in ethernet frame and why is it used? [duplicate]

I've searched all over the internet and every say that it synchronize the receiver clocks. What does that mean? Also I've seen another definition that preamble gives NIC time to realize a frame is ...
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2answers
201 views

Why can IPv4 and IPv6 use strict source routing(in options field) and flow label respectively inspite of connectionless protocol?

In IPv4 option field one field option is source routing option this means packet will always be routed by router Or not. Packet can also be routed by source such routing is known as source routing. ...
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14 views

Does the OSI model apply anywhere else other than computer networking? [duplicate]

I try to understand the OSI model, more about why it was created and what exactly it tries to achieve. The Wikipedia page says: The Open Systems Interconnection model (OSI model) is a conceptual ...
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1answer
39 views

What exactly defines a WAN?

I've found this question but it doesn't seem to answer my question. What is the "technical" definition of LAN and WAN I know that a Wan consists of more LAN's together and MAN's and it's ...
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1answer
35 views

How Switch knows if the packet reached it's destination?

In a Lan connected using switch, For the first time if the sender sends a data to the destination, then the switch will send the data to all the devices in the network, and the devices will have to ...
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1answer
20 views

In PPTP, do encapsulated packets get further encapsulated in Ethernet frames?

I know that for PPP to travel in datalink layer 2 (ethernet) , the ppp frames need to get encapsulated in a ethernet frame , thus PPPoE. Is the same case for PPTP too?
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18 views

What really a point to point connection means? [duplicate]

I know that point to point connection is used to directly connect between two nodes without any intermediate. But if we take in our world the internet(WAN) , let's say I want to achieve a point to ...
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1answer
25 views

Does a receiver send acknowledgements after data received/failed in a bus topology and in ring topology? If so, how?

if in a bus or ring topology, is there any acknowledgement or error mechanism that if a packet is sent/or failed to receive/lost.
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1answer
46 views

How do switches handle network data if the destination computer is powered off in half-way?

Consider a lan network with a switch. Assume the switch has the mac addresses of all the devices in it's newtork. If the source computer sends the data to the destination computer through a switch, ...
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1answer
43 views

Connectivity issues with 127.x.x.x series [closed]

I have a couple of servers with the below config server1: lo: 127.0.0.1/16 scope host eno1: 127.15.0.1/16 scope global eno2: 5.0.0.1/24 server2: lo: 127.0.0.1/16 (it had /8. I changed the subnet ...
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1answer
41 views

Problems with cat 6 cable

Our company have all the networking with cat 5 cables. My problem is: one of our employees bought a cat 6 cable but we don't have any rj 45 for this cable, we only have for the cat 5. I tried so many ...
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1answer
64 views

Does IPv4 of all devices follow this standard xxx.xxx.x.x?

I think the title says it all. I haven't found the answer anywhere else on the internet.
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2answers
142 views

Class D network for multicasting between group

We know Multicasting is defined as a single source sending to multiple recipients on a network when the receiver broadcasts a signal for acceptance. Multicasting has its own Class D IP addressing ...
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2answers
40 views

Can two different LANs be part of the same private network? [duplicate]

If you had two geographically dispersed LANs with public IPs that are in a different subnet range to each other, (one is 154.30.24.x/24, and the other is 134.64.9.x/24) if they were physically or ...
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1answer
45 views

Lan and baseband channel

We know the baseband line at one time send or receive data(half duplex). If more than one host send data at same time may occur collision. In bus topology see the same thing. Inspite this in home, ...
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0answers
14 views

Definition of a socket [duplicate]

I wanted to confirm whether the definition of a socket I've understood in a computer network context is true. A socket is file who is unique and named by local IP,Local port, Foreign IP and foreign ...
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2answers
99 views

What type of network cable is this and will CAT6 provide me any benefit over this?

I have a router configured as access point and connecting to the host router with four wire twisted pair cable which looks like below: I have some doubts regarding this: What type/sub type of this ...
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1answer
47 views

Why is the VPN throughput reduction different when using a cellular network and when using Ethernet? [closed]

I built a VPN server using openvpn as a protocol and measured the throughput between server and client. There are significant throughput reduction at cellular network. Throughput decreased by more ...
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0answers
18 views

how does a propagation delay is being considered as part of a nodal delay? [duplicate]

considering the definition of nodal delay, it's the time taken by the network node devices(router, switch, and hub) to process a packet and forward it to the receiver. so propagation delay is a delay ...

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