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 should I set up a network in an old mutliple floor building? [closed]

I recently moved into an old house. Were the internet is suboptimal. Right now it looks something like this: The Coaxial cable from the provider goes into the Provider Router in the basement. Then ...
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2answers
19 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
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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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3answers
47 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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TCP throughtput [closed]

Suppose I am asked to send data segments 1-12. The 4th Data segment gets lost. How the throughput is calculated consider Round Trip Time is 10ms and Maximum Segment Size=512B
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IP Failover & IP Alias for SA:MP [closed]

I host my own SA:MP Server and Teamspeak3 server , web server etc. I have 16 IP addresses on my OVH-Game dedicated server and I configured IP Aliasing. Teamspeak3 runs on all 16 IP addresses, web ...
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19 views

So I'm confused on this question for CompTIA A+ [closed]

The website says the answer is "C.", But why would you ever pick WPA over WPA2 for anything like this? Isn't WPA2 more secure? Question 3 A human resources manager requests wireless APs to be set up ...
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7 views

Assume that we use Selective Repeat algorithm with window size N=6 to transfer the file from [closed]

Question: Assume that we use Selective Repeat algorithm with window size N=6 to transfer the file from size 9. The losses occur where data segment 5 and ACK segment 3 are sent on their first ...
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1answer
32 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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13 views

How does a packet go from my computer to a server for example Google, in the first person perspective of the packet? [closed]

So, take for example my home network. It consists of 4 computers connected to a switch, which is connected to a router, which is connected to the modem to ISP. Correct me if I'm wrong, the router ...
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1answer
66 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
45 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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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
56 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
24 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
49 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
40 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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How to understand the `Flow` and `Dynamic Flow` in networking?

In networking we also hear about Flow and Dynamic Flow. such as in there, there has the dynamic flow term. How to understand flow and dynamic flow? is there any difference between them? EDIT-01 ...
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39 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
20 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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3answers
65 views

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

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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1answer
46 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
51 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://tools.ietf.org/html/rfc2385 MD5 digest is produced by applying the MD5 algorithm to ...
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1answer
30 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
59 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
73 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 ...
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19 views

Trying to establish stable connection, ping drops intermittent in PACKET TRACER

This was given by my friend and i cannot touch any of the configuration of the ISP router in the middle. but i have screenshots of routing table and interfaces. pinging the middle router from HOST A ...
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1answer
87 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
26 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
438 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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9 views

Given a subnet mask, how can I determine which addresses can be assigned to public network hosts? [duplicate]

For example, I'm given a subnet mask of 255.255.255.248 and need to determine from a list - 16.70.118.63 134.178.18.56 200.47.224.159 68.111.178.93 192.168.16.87 217.37.10.192 - which addresses can be ...
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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
30 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
83 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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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
116 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
44 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
33 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
37 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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11 views

How to divide an IPv4 network into three separate networks? [duplicate]

I have an address of 192.168.100.0(/24) and I need to separate it into three networks using VSLM. One needs 70 hosts, another needs 30 hosts and the last needs 25 hosts. What is the most efficient way ...
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1answer
58 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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10 views

Ipv6 link-local/multicast issue [duplicate]

When you ping a link-local address why is the destination (in packet tracer) to the solicited-node multicast address of the host and not the (FE80) link local address ? I understand that it needs to ...
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7answers
11k 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
229 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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1answer
42 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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34 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
41 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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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
47 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
63 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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