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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How Router sends radio signals to expected device in LAN [closed]

Suppose there are 5 devices connected to router wirelessly. Computer A sends data in terms of radio signals to the router with the help of antenna and router converts radio waves into binary and sends ...
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Some of our users are unable to access our website hosted on Azure App Service [closed]

We recently started receiving reports of some of our users being unable to access our website hosted on an Azure App Service. When they attempt to access the site they see a browser error indicating ...
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Duplicated HTTP Get call on wireshark we did not trigger [closed]

This is written by software developer and not network engineer, so sorry if too newbie. We execute HTTP GET from client to server. The URL/endpoint is with hostname/FQDN. Used both Wireshark/Process ...
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Is it OK to connect 3 switches in this fashion Switch 1 <-> Switch 3 , Switch 2 <-> Switch 3, Switch 1 <-> Switch 2 [duplicate]

Does anybody see any networking issue of connecting 3 switches the following way? Does this cause any inherent networking issue with this like loop issues? Switch 1 <-> Switch 3 Switch 2 <-&...
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1answer
33 views

Question about private ip address and public ip address

Let say a company bought a range of ip 172.16.1.0/24 , my question is this range of ip is public or private? and another question why the company not using private ip address to subnet and use NAT to ...
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1answer
70 views

What Exactly are Digital and Analog Signals?

While researching networking, i came across the term "Digital Signals" and "Analog Signals". According to the majority of sources ive viewed online, people are saying that an ...
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1answer
41 views

How can I use two WiFi routers with one cable to the ISP router?

Let me explain... There is the fiber optic ISP router on the first floor, connected to it via LAN cable is a switch, connected to the switch via LAN cable is a WiFi router on the 7th. I want to add ...
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1answer
22 views

Are passive scanners subset of active scanners?

Assuming: Passive scanners are those which do not actively send request packets, all they can do is monitor packets (which can be probe replies and beacon frames) which are passing through the ...
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2answers
47 views

Does MAC replace CSMA/CD in Ethernet?

We now that in old days Ethernet use CSMA/CD for collision domain. However, with the advent of Switches now MAC addresses are used to identify the source and destination machine. But still when I read ...
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1answer
44 views

How Ethernet protocol is related to Ethernet types such 10BASE5?

I know that Ethernet is a Data Link Layer protocol which specifies how the communication takes place b/w nodes in LAN defined by standard IEEE 802.3. I came across a book in which there were different ...
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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
821 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
79 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
24 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
79 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
39 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
549 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
96 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
34 views

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
51 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
23 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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1answer
59 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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2answers
66 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
75 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
103 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
939 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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2answers
208 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
95 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
373 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
91 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
123 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
33 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
41 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
37 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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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
218 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
41 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
37 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
26 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
48 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
49 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
42 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
68 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
167 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
42 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
56 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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