Questions tagged [network]

For questions about Networking that includes design, and use of a network, the physical cabling, hub, bridge, switch, router, and so forth. Anything in relation to networking and its technologies.

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What does network interface do? and what's difference between a network interface and a network interface card (NIC)?

I'm a little confused about the network interface. Based on my understanding, a network interface does the translation between link-layer and internet layer, and does the ARP. Is that right? Also what'...
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1answer
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How is data flow in a twisted pair cable?

If i use a ethernet cable (twisted pair cable) in what form the data is flowing - digital or analog signal. And in pair 1 that is wire no 1,2 there is transmit+, transmit- respectively. how is pair 1 ...
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Register softphone with Avaya CM [closed]

I was wondering if someone please have an idea forregistering any softphone with avaya communication manager without a gateway (like G-430, G-450...etc). I'm working on a home lab and my scinario as ...
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2answers
38 views

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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Connecting two routers on different subnets [closed]

I was wondering if someone can help me out. I've some networking knowledge but I seem to be having a problem connecting two routers together and using different subnets. I've a home network router ...
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How do I properly configure my Load Balancing Router? [closed]

Setup Description I have a TP-Link TL-R470T+ Load Balancing router setup at my home. Here is a link to the entire setup along with the routers connected etc. As can be seen from the diagram, I have ...
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1answer
27 views

How do devices discard packets?

My question is fairly simple, I'm just not entirely sure what information I'm looking for. Let's say that a host receives a packet that is supposed to be for another host, and discards it. Where is ...
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1answer
11 views

Port 8080 closed over VPN (Linux, OpenVPN, webpack, Node.js application). How to troubleshoot? [closed]

I am running a node application that uses webpack. The application starts and automatically selects the port 8080 on localhost: The website works correctly on the browser on my machine. I want now to ...
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0answers
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Some random client requests fails with unexpected TCP [RST] packets [duplicate]

I have a service doing listen that serves clients over a TCP sockets connection with a raw binary protocol. The principle is basic: the connection is established, the client sends a request with data, ...
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2answers
1k views

Is a point-to-point T1 line literally a line in real life?

In Packet Tracer this is how we draw a WAN link, or a T1 link: Does the "red line" here literally means there is a single cable connecting the two routers in real life? If no, then what are ...
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1answer
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sFlow configuration tcam question for Cisco Nexus 9396PX platform

I am trying to configure sflow on Nexus 9396PX switch and having some difficulty to understand tcam region. hardware access-list tcam region span-sflow 256 ! feature sflow sflow counter-poll-interval ...
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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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2answers
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How do machines setup a route in a network?

So I have been reading a bit about networking, and I am a bit confused about what exactly happens after domain name resolutions. Lets say I do a get request to "some.website.com". First, my ...
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2answers
94 views

How TCP sequence numbers work in bidirectional communication/sliding window?

I was trying to understand how TCP works (not in detail of course). I was surfing the web for easy-to-understand flow diagrams and a question arose and couldn't find a straight answer. Let's suppose ...
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2answers
28 views

Is packet transfer still possible, if the routers don't have the updated link cost information in the Bellman-Ford Algorithm?

In the Bellman-Ford Algorithm, the principle of "Good news travels fast but bad news travels slow" is implemented. So if the cost of the link between two routers is increased, then the ...
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1answer
38 views

Establish a network between two remote systems

Is it possible to create a network between remote systems without internet? if true; how?
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1answer
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Why I am Getting %100+ Network Usage From SNMP? [closed]

I am using SNMP in Ubuntu 20.04 to get the network usage info and I am using this formula to calculate the network usage: InOctets : The difference between two poll cycles of collecting the snmp which ...
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2answers
60 views

Why are ISPs arranged in hierarchies?

ISPs are organised in a hierarchy where the Tier 3 ISPs are connected to Tier 2, and Tier 2 ISPs are connected to Tier 1 ISPs. Why are they organised in a hierarchy? Is it because if all devices were ...
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0answers
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What enables the UE to make calls to more than just an emergency number once it's registered to a cellular network?

UE can camp on to the nearby eNB and still be able to receive RSSI signals regardless of whether the SIM is inserted or not but you would only be able to make emergency calls? What really "...
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3answers
86 views

Why is sometimes a good idea to disable auto-negotiation?

I am studying CCNA and I am trying to learn the logic of the networking. In the CCNA book, it told me that sometimes disabling auto-negotiation is a good idea but I didn't understand much why and ...
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0answers
18 views

How do switches learn the neighbour MAC address? [duplicate]

According to the CCNA Official Guide a switch learns the new MAC address by checking the source MAC address of a new frame. Here is the quote: Switches build the address table by listening to ...
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3answers
76 views

How are MPLS routers connected to each other?

So MPLS is one of the many ways to connect two or more distant sites. In other words, it is some kind of a "WAN solution". But what is the "WAN solution" for MPLS? Take for example ...
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35 views

Download ExtremeXOS

I need to update the extreme switch, I found a lot of instructions but I don't know where to download the latest version of extremeXOS. Thanks a lot in advance for your help.
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1answer
48 views

How is the subnet mask detected over the internet with CIDR (classless inter domain routing)?

Lets say there are two public IP addresses. One is 21.120.12.8/16 and the other is 21.120.12.8/8, they are different network IDs but when used over the internet how are they both differentiated? Or is ...
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3answers
63 views

Daisy chained ethernet: how to “tee” the loop without switch?

In this Schneider Electric white paper: Reduce Ethernet Connected Cost with Daisy Chain The author provides a daisy chain Ethernet topology in Figure 3: To connect the loop to another device (I'm ...
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1answer
22 views

IP flow interpretation on Logrhythm Netmon

We have a Logrhythm freemium network monitoring solution depending on port mirroring using span ports on switches to receive all traffic and analyze it. But I cannot understand the output. If I am ...
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0answers
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OSI and TCP/IP models [duplicate]

my name is Alexander. I have problems with English, but I hope you will understand me anyway. I'm preparing for CCNA 200-301 and I have some problems with OSI model. Let me give you a little context. ...
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1answer
19 views

N routers but only one valid dynamic gateway

I'm not able to figure out a good strategy for this situation. There's one router per client and all the routers are in the same network. Each router is able to connect to an external router in a ...
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1answer
36 views

RSTP Network Switch MAC address

I'm confused about something I'm new to this, for example I use network switches in my network they support RSTP protocole, So let say every switch have 5 port. Switch base MAC address , aa:bb:xx:yy:...
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1answer
41 views

IS Network automation kills carries of network Engineers? [closed]

Iam working as network engineer since long time and i enjoying working same . But now i am afraid after listening of network automation .Is network automation kills jobs of network engineer across ...
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1answer
11 views

What is the significance of configure TTL value while creating A record and AAAA Record in External DNS [closed]

Is Time to live (TTL) value has any impact on DNS querry . Because in our external DNS we generally set TTL value to 1 hours and some times 5 minutes while creating A records and AAAA records in ...
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2answers
4k views

Who has control over allocating MAC address to device manufacturers?

As of my knowledge each MAC address is unique for each device like servers, computers, firewalls, switches and routers, proxies, etc. So my question is: who is responsible for allocating these MAC ...
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1answer
34 views

STP Portfast Networks

I have switched network and on all access ports I've configured spanning-tree portfast edge When I enable spanning-tree portfast networks on trunk ports 1/0/51-52 every access port is blocked. Do I ...
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1answer
28 views

What is the difference between these two different network security devices?

I have a choice between these two network security appliances, however the only difference I can see is the year and I don't know what that year means. SONICWALL TZ300 WIRELESS-AC SECURE UPGRADE PLUS ...
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1answer
23 views

client has 2X1910 switches 1x1920 switch traffic not passing correctly some nodes are responding to pings and others are not [closed]

New to vlans, bridging across multiple L3 switches and not sure where to start so here goes in hopes of learning Layout is this 1910-24g-POE (Switch01)>>>>>>>>>>>>&...
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2answers
61 views

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
51 views

I have issue with MSS and window size [duplicate]

I made a short example because I have tried understanding the difference between MSS and window size in tcp header when we consider a sender and a receiver. So let's say sender and receiver use the ...
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1answer
122 views

TCAM carving question for Cisco Nexus 9396PX

TCAM carving question for Cisco Nexus 9396PX I have Cisco Nexus 9396PX and configure for IPv4 with IPv4 RACL on SVI to block some basic traffic. Now i have configured IPv6 and trying to configure ...
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0answers
10 views

Into how many subnets can you split this address range up at most? [duplicate]

Let's say there is address range given: 124.33.66.0/23. Into how many subnets can this address range be splitted up at most if each of these subnets includes at least 5 devices? I don't know where to ...
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0answers
28 views

Why do we need IP and MAC addresses? [duplicate]

so I have just stared to learn OSI model and I can't understand why do we need IP on the third layer AND MAC addresses on the second layer. From what I understand MAC addresses are used to move frames ...
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0answers
11 views

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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0answers
78 views

EVPN+VxLAN strange silent host issue

EVPN+VxLAN very strange silent host issue I have very basic EVPN+VxLAN design where i used OSPF/Multicast/BGP/vPC technologies to build small size datacenter. L2VNI working great without any issue. I ...
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1answer
16 views

Ping6 replies go to a different interface [closed]

Server A has two interfaces (i1 and i2) with the same IP on them, say fd11:1111:1111:1111::1/48. Server B has the same two interfaces with the same IP on them, say fd11:1111:1111:1111::2/48. When ...
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0answers
28 views

How to join servers ip adress? [closed]

i wanted to make application like a messenger, so I followed this tutorial. I just wanted to try it, and if it work, ill continue with making it better. I did everything i should and it worked.. but, ...
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2answers
46 views

How Access points differentiate stations?

I'm doing a ping from a station to another connected on the same access point. Given the fact that they are both on Wi-fi interface, how can access point know where to forward a packet?
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4answers
250 views

What are some real world applications of OSPF?

When I search for OSPF real world application or implementation, I always get the explanation of how OSPF works or how to calculate the cost. My question is, is there any real life scenarios of how ...
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3answers
767 views

Do these 2 packets belong to the same tcp socket?

Let's say we have two packets A and B. A: Has source-IP S1 , destination-IP D1 , source-port SP1 , destination-port DP1 B: Has source-IP S2 , destination-IP D1 , source-port SP2 , destination-port DP1 ...
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1answer
1k views

“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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1answer
38 views

Linux networking + mix of auto-negotiation of yes/no [closed]

we have 10 servers with Advertised auto-negotiation: yes as the machines with driver driver: i40e driver: i40e version: 2.3.2-k firmware-version: 10.51.5 expansion-rom-version: bus-info: 0000:12:00.0 ...
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1answer
115 views

Ping to default gateway failing

I am trying to ping to a default gateway which i have configured as 171.2.0.1 but somehow the ping is failing . I am new to network domain so i have less idea about it . Any help is appreciated .This ...

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