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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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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11 views

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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6 views

Unstable Phase in Channel Impulse Response [closed]

I'm using DW1000 UWB radio transceiver and extract its channel impulse response (CIR). The CIR output by the trascenver is the complex baseband CIR. I have two such transceivers, keep everything ...
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0answers
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What is the first and last address of a subnet? Is it the Network/Broadcast or the First/Last usable address? [duplicate]

For a computer science exam the question was: Find the first and last address of the subnet containing XXX.XXX.XX.XX/XX I put the network and broadcast address and got it wrong. Those who put the ...
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What is the meaning of the “nd6 options” in ifconfig interface details? [closed]

I'm trying troubleshooting an issue i'm having on my mac with a VPN software (zscaler). Comparing my machine configuration with one that is working with the same software, i've noticed that on my tun ...
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2answers
33 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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6 views

RJ45 crimping online simulator? [closed]

I was wondering if there is a web application/ Website that provides an online environment to test networking skills? specially crimping RJ45 connections just like how Tinkercad does with Arduino. ...
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0answers
9 views

Fiber — Intel x520 SFP+ with Mikrotik CRS305-1G-4S+IN SFP+ [closed]

I have an Intel 82599 X520 (dual SFP+) network adapter in my motherboard. I have a HP Procurve 1410-24g switch with SFP ports. I have a Mikrotik CRS305-1G-4S+IN switch with SFP+ ports I bought A7EL-...
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0answers
14 views

Merging 2 local networks? [closed]

First I wanted to say I'm very, very bad at networking and stuff. So... I have the 1st network and to make it easier, it's called "DabloPC" and goes from a modem. The 2nd network - "...
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Failure from PLC/HMI to AWS [closed]

i can ping the device and wireshark is showing me a RST line. can anyone help me interpret the data?
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0answers
15 views

is there a machine who can read all the packet that he received Even if it's not for him? [closed]

is there a machine who can read all the packet that he received Even if it's not for him ? I mean the ip adresse of this machine not equal to destination ip
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HA Setup WAN Switch Point of Failure [closed]

Had a back and forth email conversation with a new client.. who requested for a Network Upgrade proposal.. So basically we suggested HA setup which consists of the following 2 x FIrewall (active-...
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17 views

How to connect to two different Wifi on the one computer? [closed]

right now I have bought a '150 Mbps wireless 802.11bgn Nano USB adapter'link, and I hope this can help my computer to connect to the first Wifi. And My computer also has a original network card, I ...
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1answer
14 views

Connect to application hosted in private network on a private DNS from outside world

I have an application hosted in a 2 VMs in a private network. Out of which one application is accessible from the outside world and the other one required private DNS. So outside users are not able to ...
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2answers
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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
27 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
37 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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3answers
743 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
20 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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2answers
57 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
15 views

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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1answer
70 views

Design of 2 Lans Connected to a Watchguard m570 firewall

I have this architecture (without the firewall). I bought a Watchguard M570 as Firewall to add it in my network. My Question is : Could i use my watchguard and connect this one to my 2 LoadBlancers ...
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3answers
68 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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2answers
238 views

What is the advantage of Supervised Machine Learning over Deep Packet Inspection in Network Traffic Classification?

As per the definition of Deep Packet Inspection (DPI), it uses signatures for packet filtering. Supervised Machine Learning can help put a label on a packet which does not get identified by Deep ...
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1answer
32 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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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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1answer
155 views

EVPN VxLAN arp suppression TCAM carving

Deploying Clos design network using leaf Cisco Nexus 9396PX and when trying to configure arp-suppression using tcam carving getting this error Free up tcam slice from VACL (default vacl tcam is 512) # ...
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0answers
23 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
153 views

How is the PPP protocol byte-oriented as well as bit-oriented?

Many articles considered PPP as a byte-oriented, and the others mention it as a bit-oriented. +----------+----------+----------+----------+------------ | Flag | Address | Control | ...
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1answer
47 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
46 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
10 views

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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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
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
35 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
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
179 views

Can we use both RSTP and MSTP spanning tree protocols in same network

I have network connecting with 500 users and 50 servers connecting different layer3 switches and layer2 switch. Can i run rstp in few switches and mstp on remaining switches.
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5answers
4k views

How is 8 bits sufficient for the TTL in an IP header?

The TTL (Time to Live) is an 8-bit field in the IPv4 header. It can take any value from 0 to 255. If this means that the packet can take a maximum of 255 hops (routers) on its way to its destination, ...
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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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2answers
65 views

When traffic is intiàted from pc is ANDing process or ARP process start working first

When traffic is initiated from desktop which process starts first; the ARP process or ANDing process?
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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
54 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
4k views

Add ports on Packet Tracer 7

how do you create new ports using WMIC-4ESW on my routers on packet tracer 7? both of my routers have 2 GigaEthernet and I used them because my 2 networks on each router. I need to be able to add more ...
1
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1answer
40 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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3answers
349 views

Do all computers on a wifi network have the same Network ID in their IP address?

I'm trying to clear something up that I haven't been able to get a simple answer to. If I have multiple computers on the same wifi network, is it correct that they will have the same network ID, but ...
3
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1answer
98 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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