Questions tagged [networking]

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

Filter by
Sorted by
Tagged with
0
votes
1answer
7 views

Why cant we create a hierarchy of hubs?

I was reading the Comptia Network+ All in One book and I came to know that we cannot create a hierarchy of hubs. My question is why so ? Are uplink ports simplex ? Why is it not possible for the hubs ...
0
votes
0answers
5 views

Azure Private Link [closed]

In Azure Private Link, how is it possible to have for example a SQL server which does not have an internet gateway, NAT devices or a public IP address but still being able to connect externally ...
0
votes
1answer
18 views

Unicast and Multicast MAC address convention

I need help in understanding how Unicast and Multicast MAC address is differentiated as explained in wiki. According to what I understood, when the least significant bit is set as 0 in the first octet ...
0
votes
0answers
9 views

How to access a local server from the internet? [closed]

I have a web server locally, but I would like to be able to access it from the internet. I configured No-ip on the server and created virtual servers in Load Balance, TP-Link and ISP modems. But ...
0
votes
0answers
16 views

VPN placement on router behind firewall [closed]

Currently our config is: ISP Router > Firewall > Internal Router Equipment: Firewall is a SonicWall NSa 4650 and the Router is a Cisco RV345 We want to use a VPN for site-to-site purposes but ...
0
votes
0answers
4 views

Network Address Translation between different computers [closed]

Suppose you have two computer CA & CB. Both are located behind the NAT’s (Network Address Translation) and have following credentials. CA’S IP Address CA’s Port Number CB’S IP Address CB’s Port ...
0
votes
0answers
17 views

TCP retransmission and then RST to a single IP

What can you tell from the following wirehshark capture? Occasionally I'm having issues connecting to the destination IP. So if someone can tell what could be possible causing the TCP retransmission ...
-1
votes
0answers
15 views

Create a local network without internet access [closed]

Let's say I were to build a robot with multiple raspberry pi's and wanted to connect them all wirelessly so that they could talk. I don't need internet access just a simple network to connect these pi'...
0
votes
1answer
17 views

Does Telnet need to be activated on both devices I am using or not? [closed]

I've searched everywhere for the answer to this question but can't find a simple yes or no. Basically, I have a virtual server hosting some services and then a physical panel PC in another part of the ...
0
votes
1answer
27 views

filling routing table with next hop addresses

in a multi hop network when the packet leaves the source is it loaded with all the ips of the stops on its journey, then at each hop it checks the bitmask with the nodes routing table to see if this ...
0
votes
1answer
94 views

Can not add a Physical port into LAG

Using SuperMicro network module, which related to Intel SDN product, the command PDF . and the Web GUI manual. there I have qe57, qe61, qe65, qe69 four upstream ports, I want to aggregate them to one ...
1
vote
1answer
145 views

what is the definition of out degree and in degree in computer networks?

in wikipedia we have a good definition for in degree and out degree in a graph: " The degree of a node is the number of connections or edges the node has to other nodes. in-degree is the number of ...
0
votes
1answer
59 views

What steps must be accomplished in each layer of the TCP/IP model to connect a website?

What steps must be accomplished in each layer of the TCP/IP model to connect a website?
0
votes
0answers
14 views

Which of the following components are typically used only for telephone cable installations and not for data networking [closed]

I am revising for the network+ cert and saw the above question in a guide. The choice of answers is(multiple can be correct btw): a) 66block b) 110block c) 25pair UTP cables d) 100pairUTP cables. I ...
0
votes
1answer
51 views

Is it possible to setup IPsec behind NAT without port forwarding?

We want to setup a IPsec connection between customer sites and our office so we can manage the hardware we place at customer sites (e.g. barriers). Its important that the VPN connection stays up all ...
0
votes
1answer
33 views

Routers and layer 3 switches for connecting two buildings on site using fiber

I understand layer 3 switches are essentially routers, but often don't have the capabilities a router has, e.g. NAT. So I'm trying to work out where it would be necessary to have layer 3 switches vs ...
0
votes
2answers
32 views

Assigning IP addresses to multiple switches

Thank you in advance for taking the time to read my question, i appreciate it. I am in need of help on IP assigning to 4 brand NEW Araknis switches that I am replacing with the current netgear/tp-link ...
1
vote
1answer
59 views

Do mobile phones continuously broadcast their IMEI number so that cell towers can find them?

Edward Snowden said that in an interview. Is it exactly true? Does it have to do with SSN (sim serial number)? Is the SSN broadcasted with encryption and modulation done to it or is the IMEI number?
1
vote
0answers
5 views

5g authentication method for IoT [closed]

While i was studying authentication methods in 5g i bumped into 3 authentication methods that seems to be the most important ones: 5G-AKA,EAP-AKA,EAP-TLS. Which one of these three could be more ...
0
votes
1answer
35 views

TCP Handshaking Meaning of RST

I am trying to implement TCP handshaking but receive RST instead of ACK: No. Time Source Destination Protocol Length Info 62 24.622012890 192.168.0.147 ...
0
votes
1answer
3k views

missing Packet tracer physical Tab

hello I am using packet tracer for a while.I use in my college computer. but recently I installed in my pc. when ever I try to add extra ports in my rouer or switch the physical tab is missing
0
votes
2answers
62 views

Why cant i reach the other network while i have added the routes and firewall rules to allow traffic? (Pfsense/USG200)

I have 2 networks, the current one and the new one. The current one is not configured by me and one big mess and contains heavily out dated hardware (especially servers). I want to be able to access ...
0
votes
3answers
47 views

Why is the trace route to a particular IP not the same as trace route from that IP to mine?

So i am running a trace route from http://www.speedtest.com.sg/tr.php to my system. i get a route. And i run a trace route from my system to the website above i get a different route. Why is that? Why ...
0
votes
2answers
42 views

Reconciling multiple definitions of Bandwidth

I am confused about the meaning of the term 'Bandwidth' in a wireless transmission environment. The two most common definitions I could find are: difference between the upper and lower frequencies in ...
0
votes
2answers
35 views

Modify the IP in TCP/IP packet

My ip address is specified in the ip packet sent to the next node. I wonder if a device that handles this packet can modify the ip address before forwarding it to the final destination? In theory ...
0
votes
0answers
13 views

CCNA static IPv6 interface id understanding question [duplicate]

Hello, Can anyone advise why I would add ::1 to a subnet in IPv6? In this case I am looking to use the global unicast address and not the link-local even though I would normally do this.I would add ...
0
votes
1answer
16 views

Whether PPTP Client need virtual interface to communicate with PPTP Server? [closed]

We know in PPTP VPN, the VPN Server is using a virtual Interface to provide encrypted data. Whether PPTP Client need virtual interface to communicate with PPTP Server? and more, if yes, whether ...
1
vote
1answer
43 views

Can people with an ISP access your network if it is on the Default Free Zone?

Let's say you have a router on the DFZ (despite costing an absurd ammount of money). Would your network work the same as if you have an ISP in terms of web hosting, etc? Can people still access your ...
1
vote
1answer
52 views

Two sites with public IP's in same subnet. Spoof detection

I have encountered an non standard issue and can't seem to figure out a way to get it to work. I have 2 sites, 1 main and one branch. At the main site I have 2 ISP's and the branch I have only 1 ISP....
0
votes
4answers
82 views

Firewall placement

Ok, so I'm confused on the placement of firewalls, most diagrams I come across are as follows: ISP > router > firewall However, I'm confused about this, surely you would want a firewall before the ...
1
vote
0answers
79 views

Why can't i reach devices in the other network?

I have 2 networks and want to connect them with each other. It should be possible that all devices in network A can communicate with devices on network B and other way round. 1 network is "managed" by ...
1
vote
2answers
64 views

Vlan vs. Subnet Broadcast Domain

It is my understanding that Vlans separate broadcast domains, but I often see people say, "subnets define a broadcast domain" as well. Is it correct to say, "Vlans define a L2 broadcast domain, and ...
0
votes
1answer
16 views

Some questions about a DMZ and where to place my web servers? [duplicate]

Currently i build a new network for our company which is not my specialism as i'm actually a software engineer so excuse me when this is a stupid question. I read a lot about networking last few ...
0
votes
2answers
44 views

Best way to make a network failsafe?

I have a Debian based machine with 2 completely different network interfaces from 2 different ISPs acting as a backup for my server connection. These have two different IPs (Let's say IP1 and ...
0
votes
1answer
23 views

Understanding IP scheme, distribution and usage [duplicate]

I'm new to networking and I'm doing my best to understand how things work. I do have a problem in understanding IP scheme idea (even though obsolete), more specifically, their structure, distribution ...
0
votes
1answer
21 views

Additional subnets in a class C IP [duplicate]

If i'm designing a new subnet mask for a class C IP that will have 5 subnets that means I need to borrow 3 digits since 2^3-2 > 5. My question is, how many additional subnets do we have? would it be ...
0
votes
3answers
48 views

Are there any alternative devices to routers?

I am not talking about the router used at home to access Internet . I am talking about devices used in the network core. I want to know if there are alternative devices, if any, used for forwarding ...
0
votes
2answers
28 views

Will TCP packets smaller than the full bandwidth of its link travel at the same speed?

If I send 5bytes over a 1mbps connection will that travel faster than 500bytes. Or is the latency after propagation going to be constant since the packet is under 1mb? If you downvote because you ...
24
votes
7answers
10k views

Why can I traceroute to this IP address, but not ping?

I have an IP address and can traceroute to it, but I can not ping. You see, I can traceroute 43.24.226.50: dele-MBP:~ ll$ traceroute 43.24.226.50 traceroute to 43.24.226.50 (43.24.226.50), 64 hops ...
6
votes
2answers
1k views

Encapsulation: can a higher protocol encapsulate a lower protocol?

I've heard someone say that a protocol higher up the osi model can encapsulate a lower protocol. As far as I know, personally, a protocol can only encapsulate a same-level protocol or one at a ...
0
votes
2answers
30 views

Who owns the in between routers displayed when I execute a traceroute command?

When i traceroute a website, i get the IPs of all the routers in the path between me and the website. Who owns all those routers? Are they organized in a particular kind of building?
0
votes
2answers
36 views

Fat-Tree topology

Fat tree network topology looks like a tree topology like below figure. In tree topology, we have same terminologies like Root, parent, child etc. This is mainly used to connect a large number of ...
1
vote
0answers
15 views

How many times is the data packet copied before finally reaching the NIC? [closed]

On a typical linux machine, how many times would packets be copied from the application layer to all the way in its journey to the network card. I am assuming the protocol being used here is TCP/IP ...
1
vote
2answers
67 views

Which is the best way to encrypt all the IP traffic in LAN?

I'm trying to encrypt all the IP traffic in a small LAN network but the in that network all kind of devices are connected i.e. PCs, Laptops, IP Cameras, IP Sensors, etc (new and old devices). I have ...
1
vote
1answer
45 views

Which of TCP flags will use a timer, and what Timer will use?

When I study the TCP protocol life cycle, There are 3 stages: Establish Connection Data Transmission Connection Removal TCP have 6 Flag types: SYN, ACK, PSH, FIN, RST, URG. TCP has 4 Timer: ...
0
votes
0answers
6 views

Why does the sender assume that packet n is lost if it receives 3 back to back ACKs of packet n-1? [duplicate]

I came across an unjustified statement in my study notes regarding TCP: If sender receives 3 duplicate ACKS back-to-back, it assumes that the next packet in sequence was lost, and re-transmits. ...
0
votes
1answer
39 views

why the size of a frame is dependent on the data that is being sent in the payload of the frame

I'm new to networking, just a question on frame size. I was reading a book which says: An interesting characteristic of character/byte stuffing, is that the size of a frame is dependent on the data ...
1
vote
1answer
96 views

Does a PC have a MAC address table?

I have a network topology like this: We know switch has MAC address table, but does the PC have MAC address table? I know PC have ARP table in Windows I can use arp -a display all the arp information ...
0
votes
1answer
43 views

Create IPSEC VPN between three Routers?

I'm attempt to build essentially an IPSEC tunnel mesh between three Cisco IOSv routers. I've been able to build an IPSEC tunnel between two directly connected routers but once I add the third router ...
0
votes
1answer
26 views

Getting network traffic of a remote IP? [closed]

(Not sure if this is the right place to ask) I want to get the network traffic and packets of an IP outside of my network from IP. For example, I can sniff my own network using Wireshark. Just like ...

1
2 3 4 5 6