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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1answer
29 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 ...
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2answers
1k views

Fiber dBm transceiver power level at warning

We have cisco nexus 9000 and one of 40G interface showing port transceiver power level at warning when i check on command line i found following. Question: what is the normal power level for ...
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1answer
26 views

Why there is a statement of FIN packet is easy to discard in the networking?

In Nmap port scan there is a Covert scanning which use FIN for scanning, but it is not accurate, because the FIN packet easy be discard in transmission. Why there is a statement of FIN packet is ...
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4answers
248 views

setting up a VLAN and joining 2 buildings through underground cabling

I am pretty much a newbie when it comes to networks so forgive me in advance if this question seems odd. So here's a situation I am trying to figure out. There's a company who operates in 2 adjacent ...
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2answers
159 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: ...
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1answer
2k views

Switch doesn't learn MAC of a connected device

I am new to networks. What does it mean when a switch doesn't learn the MAC address of the connected device? And how can VLANs can impact that?
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2answers
51 views

Switch Operation Beyond VLAN Segmentation

What are the other operations performed by a switch which are outside the VLAN's boundaries. Is Logical (VLAN) Segregation is exactly same as breaking a switching network physically via a Router?
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2answers
99 views

Can two or more computers that are physically close together form a connection/network without a router? If they can, how do they do so?

So, I am pretty familiar with things when a router is used. To my knowledge, packets travel from Computer A to the router, then the router directs it to Computer B. Problem solved. I get confused when ...
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1answer
154 views

How Many Extension Headers Can an IPv6 Packet Have?

How many next-header extensions can an IPv6 packet contain? I read here that it can contains: None, one, or more. which isn't very informative. Below is a reference to an IPv6 packet I'm looking ...
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1answer
212 views

Will arp table on the host (linux) will refresh after no of failure?

Let say I have a remote hostA and remote hostB. Initially hostA has an IP address of ADDR1 and hostB has an IP address of ADDR2. Now clientA made a successful connection with hostA using ADDR1. ...
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1answer
131 views

How my neighbour machines in the same network knows my interface ip?

In my local machine if I set the IP address to an interface, how other machines know this and route the packets to me if anyone tries to send packets to my new IP? I am in a private network.
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2answers
239 views

What my traceroute only list one hop?

This is my topology in my network. It's easy to know my server can communicate to 172.18.32.254/24. But when I traceroute the path, I only get one hop to it. My doubt is why it do not through 102....
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2answers
455 views

What's the inline monitoring?

What's the inline monitoring? I searched wikipedia and google but do not find the meaning of inline monitoring for network. who can tell me the definition of it? I can get the definition of passive ...
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0answers
48 views

How does direct sequence n-bit chipping code recover bit in the event of interference?

Say for example my data stream was 1010.Using 4-bit chipping code, with a random sequence of 0100101101011001. The XOR'd data which the receiver receives is 1011101110101001. I understand that ...
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4answers
407 views

What's an uplink port? Is it a port that simply uses Auto-MDIX? [duplicate]

Uplink port is used so there is no need for crossover cable, right? Does it use Auto-MDIX or is it an entirely different thing? if so what's the difference? please help :(
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2answers
2k 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 ...
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1answer
278 views

How is the MD5 hash calculated in BGP?

The RFC is very superficial on the implementation details. What is the injective function being used? https://www.rfc-editor.org/rfc/rfc2385 MD5 digest is produced by applying the MD5 algorithm to ...
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1answer
46 views

What is the difference in packet structure for tag VLAN and port VLAN

I am new to networking. I just want to know the difference in ethrenet packet structure for tag based VLAN and port based VLAN. For tag VLAN, a VLAN tag is added to the ethernet packet frame so that ...
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4answers
74 views

P2P Connections

Hey there I am a noob in the field of networking and I have a confusion: What is the difference between point-to-point and end-to-end connection ?
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1answer
2k views

Connecting a 10 Gig server to a 1 Gig switch

Recently we purchased 5 servers. It has 4 10GB ports + 1 1GB Management port, as follow: 4x 10GB ports per server (2x traffic, 2x ISCSI), and (1x 1GB management port) However, we are trying to see if ...
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1answer
566 views

Symmetric routing and asymmetric routing plz elaborate

First of all thanks, Am pretty much confused this both term of routing read blog's and notes but still kinda confused.
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1answer
159 views

Traceroute seems to succeed but also gives host is unreachable message [duplicate]

I have done a traceroute from the Princeton traceroute server ("https://www.net.princeton.edu/traceroute.html") to the ip address 129.97.208.23. This is the following result I received: tracing path ...
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2answers
1k views

How is the term "fabric" defined in networking?

I know this is fundamental and I can find out in Google but so many people differ themselves when they talk about network "fabric". Kindly elaborate on this ?
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3answers
2k views

What is the least possible separation of two NICs with the same MAC address?

Suppose you have two NICs with the same MAC address, but not necessarily the same IP address. What is the least possible separation (in terms of number of switches, routers, different IP subnets etc.) ...
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1answer
146 views

Unable to receive logs from a device to our SIEM Syslog server via TCP 514 [closed]

I want to collect logs from a security device (McAfee Email Gateway) to our SIEM Syslog server. This security device can forward logs only via TCP syslog on any port (in our case it is 514). We are ...
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1answer
356 views

Removing VLANs from core trunks (.1q)....?

I am a little embarrassed I do not know the answer to this already, well I think I know the answer but I am not 100% sure and this I need to be 100% sure on. We have several core .1q trunks that we ...
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0answers
938 views

Connecting GNS3 Topology to the Internet

I'm trying to connect my small topology to the internet through the Cloud device, but I'm not able to connect to even my own desktop's IP from the virtual router I have. I have Windows Defender rules ...
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2answers
2k views

Can a single subnet work across several switches?

New to networking and studying hard but limited access to a kit to try things at the moment... My question is - if I had, for example, two Layer-2 switches cable connected, could I have devices on ...
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2answers
263 views

Relationship between full duplex and speed

Full-duplex data transmission means that data can be transmitted in both directions on a signal carrier at the same time. but my question is if we have an interface with 100Mb speed and full-duplex ...
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1answer
79 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....
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0answers
106 views

What services are included in DMZ(DeMilitarized Zone) and what services are in HSZ(High Security Zone)? [closed]

In an organization, How to determine what goes into DMZ and what goes to HSZ?
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1answer
95 views

Does UDP perform packet re-ordering at the destination?

User Datagram Protocol is a simpler message-based connectionless protocol. Connectionless protocols do not set up a dedicated end-to-end connection. Communication is achieved by transmitting ...
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8answers
24k views

Why does DHCP use UDP and not TCP?

DHCP uses UDP as its transport protocol. DHCP messages that a client sends to a server are sent to well-known port 67 (UDP—Bootstrap Protocol and DHCP). DHCP Messages  that a server sends to a client ...
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2answers
7k views

MTU 9000 and 1500 when machines with MTU 1500 send data to machines with MTU 9000

we have some machines in the cluster linux machines as Linux_a , linux_b are configured with MTU 1500 while linux machines - linux_1 and linux_2 are configured with MTU 9000 so linux machines - ...
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2answers
334 views

How to handle multicast address collisions?

Assume 2 multicast IP addresses IP1 and IP2 whose mac addresses are same due to collision Let's say a host's NIC has joined multicast stream IP1 and another host on the original host's subnet joined ...
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0answers
89 views

There have DHCP relay for different vlans issue in my MX-480 router

I have the network topology: in this topology, in my router, I set the DHCP relay: admin@MX-RE0# show forwarding-options dhcp-relay server-group { smart_group { 103.57.xxx.19; } } ...
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2answers
162 views

What's the "routing-instance" in networking?

When I read this Article: there is a term routing-instance, how to understand this term?
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0answers
13 views

How to calculate bits needed for host, bits left for network, number of available networks? [duplicate]

I have a class b address of 145.14.0.0 I need to create a scheme where each subnet accommodates 2259 hosts. can someone explain step by step how to do that
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1answer
67 views

What are Cisco Devices? [closed]

I am doing CCNA online and not for a minute have I not failed to come acroos the statement 'Cisco Device' What exactly are cisco devices ? Please don't tell me 'Devices that use Cisco iOS' Can you ...
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1answer
127 views

Why computers can communicate on different networks and routers won't?

I have a problem that I can not understand it myself and I need some help. I'm doing a kind of challenge, well network challenge in cisco packet tracer. I have a .pka file that stands for Cisco Packet ...
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1answer
890 views

Crossover Cabling - Reversing TX and RX Signals [duplicate]

It is often said that crossover cables 'reverse the transmit and receive signals' compared to straight through cables. However I am yet to see an actual explanation of why the reversal of signals is ...
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3answers
397 views

How to find out which port is located on a switch physically

I'm trying to physically located a port on a switch. I know which port the mac address is connected to. The port is Gi2/0/14. But this is part of a stack. How do I know which switch this port belongs ...
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2answers
310 views

Cisco ASA and a Router?

I'm trying to understand networking and when looking at the different routers, firewalls and switches, I came across Cisco ASA which many use for firewall and routing abilities, so if you use an ASA ...
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1answer
79 views

Route advertisement and FIB programming

Que1. Assuming bgp is running on a network device, will the route advertisement and FIB programming(basically populating entries in hardware) occur in parallel? Or does it occur sequentially, meaning, ...
1
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1answer
798 views

What layers of the TCP/IP model does an SDN involve?

New to Software-Defined Networks. I know that an SDN involves an Application plane, a control plane and infrastructure plane. By definition, I know that the application plane is in the Application ...
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1answer
265 views

What is the difference between meters and queues in Openflow?

I'm new to OpenFlow and have just started studying Software Defined Networking. I have found a multiple websites mentioning that queues and meters are complementary to each other, and that they should ...
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4answers
529 views

Connecting 2 buildings

If I have 2 buildings connected to each other and they both run to the same ISP, would both buildings need to be connected to a firewall? For the main building I've placed a firewall just before the ...
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1answer
37 views

Is it possible to query interface statistics bytes by given start time to end time in Juniper Device?

I can query a interface detail: admin@Juniper-EX# run show interfaces ge-0/0/1 detail Physical interface: ge-0/0/1, Enabled, Physical link is Down Interface index: 131, SNMP ifIndex: 504, ...
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0answers
44 views

CISCO Packet Tracer

Does Cisco Packet Tracer support config memory and config network command? If no, then do enterprise routers still support it?
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1answer
41 views

Suitable Laptops

Not sure if this topic or question has been asked before but if I was to buy a 2019 top spec macbook pro, would instill be able to connect to Cisco devices, I'll be running windows on it as well but ...

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