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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Which protocols do mobile applications use

So when devices access web applications on the Internet they commonly use https/ftp/smtp etc.. protocols. But which protocols are used by mobile phone apps to communicate with servers. E.g Which ...
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Understanding Layer Model motivation and how it works [duplicate]

Clarification: I already read the answers in OSI Models and Networking Protocols Relantionships question, and doest not resolve my doubts. Good day, I have been studying and reading an introduction to ...
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Cat.6 RJ45 pass through connector issues

I am planning to use Cat.6 RJ45 pass through connectors in an office network with around 70 LAN cables. I am worrying if the copper wire endings open in air will have any problems when humidity is ...
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Netmiko - problem with confirmation in configuration mode [closed]

I just start using netmiko and have a problem with one script. The script should delete a user and create another one in Cisco device. The problem that I have is with confirmation in configuration ...
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8 views

I have two powerline adapters. If I buy another two of the same brand and model they will all work? [closed]

More details: The model is TP-LINK TL-PA411KIT AV500. I have one connected to the router and one in a bedroom. Can I buy another two and add them in other bedrooms?
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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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13 views

Network switches and router integration [closed]

I have more than 70 users in my network. I just need to give them internet access. 56 will be in lab are their working nature will be same. Rest of the user belongs to HR and other departments and can ...
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2answers
38 views

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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1answer
25 views

TCP ACK confusion

When a packet is being sent after the SYN ACK connection has been established between a host and a server, packets can now be sent between the hosts and a server. Sometimes, there’s a window size ...
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2answers
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Questions about logical-systems of juniper

In my Juniper MX480, the logic-systems config is below: [edit] logical-systems { r1 { interfaces { ge-0/0/0 { unit 0 { family inet { ...
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1answer
34 views

Is it possible to configure Cisco ASR901 as a layer 2 VLAN switch?

I have been fiddling with a Cisco ASR901 for a while now, but I can't wrap my head around configuring it as a layer 2 VLAN switch. Is it not possible to configure one of its Gigabit Ethernet ports as ...
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24 views

What is a CNAME and what are some of its benefits? [closed]

What is a CNAME and what are some of its benefits? For example, how does it differ from A & AAAA records?
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1answer
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what are scenario where re-transmission packets can been seen in wireshark logs

While troubleshooting i came across this challenge ,able to see retransmission packets continuously in packet capture . please let me know in what scenarios this retransmission packets are seen.
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1answer
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what is significance of proxy id while configuring site to site vpn tunnel . why we should use proxy id and in which scenarios

i came know about proxy id configuration for first time. when iam troubleshooting site to site vpn tunnel configuration along with vendor . post configuring proxy id issue got resolved . But iam still ...
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0answers
11 views

Bit confused in difference between (RST) & ( RST ACK) Packets on logs [duplicate]

what might be main difference between [RST] & [RST ACK] packets in Wireshark logs . is there any significant difference among this two scenarios or both are same . please highlight.
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1answer
24 views

Why is Cisco router PPPoE client configuration so complicated? [closed]

In some routers like Ubiquiti's UniFi Security Gateway, when you want to connect to internet via PPPoE, all you have to do is go to the web GUI or controller, go to WAN settings, hit the dropdown ...
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3answers
49 views

Why does a queue of a network device like router starts to fill up if the arrival rate equals the transmission rate of the outbound link?

In the book "Computer Networks: A Top Down Approach by Kurose" it is written that when the traffic intensity approaches 1, the average queue length gets larger and larger. Traffic intensity ...
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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
21 views

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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1answer
21 views

test etherchannel load-balance command doesn't work

I am trying to learn the etherchannel environment but when I enter this command it gives an error. Switch#test etherchannel load-balance interface po1 mac 00d0.ba86.1e19 00d0.ba86.1e1a ^ % ...
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1answer
43 views

What are the differences between root primary and secondary?

Hello I am new at networking and studying for CCNA. There is a paragraph like this in the book and I am struggling about understanding well. Maybe it's because english is not my native language. ...
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2answers
57 views

Why the iBGP's loopback network is not valid in AS?

This is my test topology: this is my Routers' detail configuration: <R1>display current-configuration # sysname R1 # router id 1.1.1.1 # aaa authentication-scheme default authorization-...
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1answer
53 views

How does STP attack work?

I was reading how STP works and an idea came to my mind. I thought about an attacker can add a new switch (somehow, i don't know if it can be done remotely) or can manipulate the existing switch's ...
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1answer
40 views

Why the iBGP received network is not valid?

I test the BGP in my PC, this below is the topology: R1--(eBGP)--R2--(iBGP)--R3. and R2-R3-R4 are in OSPF(omit details). this is my detail configuration of BGP: [R1-bgp]dis this # bgp 100 peer 10.1....
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2answers
23 views

How does the VTP Client update it's information if the revision number is equal?

I am new to networking and my questions may be a bit weird. Please correct me if I am wrong. According to what I understand, Client updates it's information with the Server's if the Server's revision ...
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0answers
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How to divide a network into equal subnets? [duplicate]

Split the network 10.200.20.0/27 into 4 subnets and submit the network address of the 3rd subnet as the answer. Split the network 10.200.20.0/27 into 4 subnets and submit the broadcast address of the ...
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1answer
16 views

Understanding the BGP Peer point, BGP Peer and BGP peering session

In my test case, there have 3 ASs. the connections is below: I want to use this case to understand the BGP peer , BGP peering point and BGP peering session. in my understanding: BGP peer means the ...
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1answer
36 views

Why the route comes from different AS?

Before, I know the AS path of BGP properties, such as the 200 100i means the route originate from AS100, use network import the route and through AS200, however in my case: admin@MX480> show route ...
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1answer
18 views

Enabling interface TenGigE0/0/2/0 pls help

I'm trying to enable just one SFP+ port for testing a 10gbit NIC. I cannot, however, for the life of me find how to enable a port. To me, it would make sense to conf t interfaces TenGigE0/0/2/0 admin ...
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1answer
41 views

How routers route packets to a specific network

As I understand it, routers route packets to a specific network based on network id and of course the network id must be unique on the Internet, now the question is: maybe there are billions of ...
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1answer
38 views

What is the maximum number of networks in IPv4?

From my understanding, in IPv4 addressing, the first 2 octets identify the network, meaning 2^16 networks can exist. But that doesn't seem even closly enough as the population in even USA is above 300 ...
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1answer
28 views

Why CSMA/CD and CSMA/CA are classified as broadcast based?

In CSMA/CD and CSMA/CA , why the Communication mode for these two access methods are classified as Broadcast based ? For CSMA/CA a Node sends a broadcast message to notify the other nodes on the ...
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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
37 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 ...
2
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1answer
20 views

Unable to Communicate from server to other servers after migrating from existing firewall to new firewall

In our existing environment we had migrated old firewall with new firewall after this activity . we had faced connectivity issue . From servers unable to reach other servers . Post clearing ARP table ...
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1answer
33 views

For UDP traffic reverse route is required or not

when compared to TCP protocol, UDP is non reliable protocol no knowledgement packet is required for previous packet before sending new packet . so in this case reverse route configuration is required ...
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1answer
33 views

Very confused on this part , two network interface Card(NIC) are configured on server [closed]

i am very much confused on this scenario . This is first time i am seeing two NIC cards are configured for server ,now my query is how to route traffic initiated at server end for NIC interfaces
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1answer
39 views

What might be the potential impact on increasing or decreasing MTU size of packet in network

i am looking eagerly to know the potential impact on network while and after changing maximum transmissions (MTU ) from 1500 default value to any other value .
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2answers
23 views

Why Ping Reply Succcess from different subnet IPs

In the university lab, i manually added IP in two ubuntu machines. PC1 IP 10.129.2.33 255.255.0.0 and PC2 IP 10.129.2.165 255.255.255.0. I connected first both computers with direct ethernet cable ...
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0answers
32 views

Router on one side of a GRE tunnel not adding OSPF route through the tunnel whilst the router on the other side is

I have configured GRE tunnel between the Dublin and Carlow routers with the following commands: //Carlow int tunnel 0 ip address 172.16.12.1 255.255.255.252 tunnel source s0/0/0 tunnel destination 87....
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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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12 views

Why public VIF must be used in AWS Direct Connect + VPN setup?

I am unsure why public VIF must be used in AWS Direct Connect + VPN setup. Usually if you are connecting to Virtual Private Gateway you should use private VIF as shown in AWS Managed VPN Diagram on ...
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1answer
36 views

iperf between two computers on different networks [closed]

Is it possible to check bandwidth using iperf between two computers on different networks(i.e geographically apart)?. I researched a lot and every answer on stack exchanges or any other website ...
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0answers
9 views

Is there any way to send different data packets together over wireline/wireless link? [duplicate]

I would like to know if there is a technology that allow to send many packets (of different data) together and at the same time over communication link (whether in wireline or wireless networks) of ...
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1answer
63 views

How does Network Layer behave when client received a unicast DHCP offer?

I went through various stack exchange post to understand the concept of DHCP offer when it comes as a unicast to client from the DHCP server. A server can send a unicast DHCP offer since it knows the ...
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18 views

WAN Frames vs. STS-1 and T1 Frames

I am having trouble understanding the need for WAN frames, such as PPP when using the SONET Protocol or T-Carrier System. Since SONET uses STS-1 frames and T-Carrier uses T1 frames, why is there a ...
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1answer
41 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
20 views

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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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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27 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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