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Variable Length Subnet Mask with two hosts [duplicate]

I started learning subnetting and i encountered some problem involving Variable Length Subnet Mask and which problems i encountered so far is it just specify a specific number of host per subnet but ...
0 votes
0 answers
8 views

Spikes while pinging localhost [closed]

Is it normal to get some spikes while pinging the router? Normally I get some spikes of max 15ms and I am using a wired connection, this doesn't seems to be right. My interface is a gigabit, my cable ...
0 votes
1 answer
18 views

I am trying to wrap my head around NDP

I know before PC10 can ping PC11 it will use IPv6 Neighbor Discovery to resolve the Destination MAC address for layer 2 header. But what would the DEST MAC ADDR be and what topics can I learn this
0 votes
2 answers
20 views

Routing help - can ping device to router, but not device to router to device [duplicate]

for some reasons I don't want to go into (there is only one kind of router that can transmitt data throught that long internet cable) I have to have 2 NATS here is a picture of my network diagram I ...
1 vote
1 answer
23 views

Is there a term for application layer protocols that are responsibilities of network engineers?

In studying network engineering, it is usually taught that network engineers are responsible from physical layer up to transport layer, that is, layer 1-4 only. Obviously, HTTP or HTTPS are off-topic ...
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0 votes
0 answers
12 views

Non-physical Loopback detection error in Network [closed]

We have network consisting of switches from Cisco and D-link. The Network Diagram is as shown below: Switches from Cisco, SG-350X Layer 3 switch is used at each floor and SX-350X Layer 3 switch is ...
-1 votes
0 answers
13 views

CompTIA Network+ N10-008 Post-Assessment Quiz [closed]

Jamie needs to subnet the network 192.168.3.0/24 into 4 equally sized subnetworks. Which of the following would be the subnet ID for the address 192.168.3.201
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0 votes
0 answers
11 views

Access point has incredible slow speed [closed]

I set up 4G LTE network because I live in a village so there is no better solution. I have the router in the attic: ZTE NETBOX MF-258K. On the second floor speed of the Internet is good, I am ...
  • 101
0 votes
0 answers
8 views

Inconsistent iperf behaviour [closed]

I am currently setting up some tests with iperf to add artificial load between two linux servers node0 and node1. When I run it without any bandwidth specification, iperf goes for the maximum (that is ...
0 votes
0 answers
11 views

How are IP addresses assigned for two routers in the same network? [closed]

Let’s say I have a home network with a router which goes to the main router which in turn goes to Internet In this case how is my network seen from the main router in terms of IP addressing? If the ...
3 votes
1 answer
94 views

Where does the "Reliable Data Transfer" (RDT) concept come from?

A while ago I took a Networks class at my university, and we spent a great deal of time talking about "Reliable Data Transfer" (RDT), as detailed in many articles and textbooks similar to ...
  • 131
0 votes
0 answers
5 views

Is It Possible to Make an EC2 Instance Part of a VPN Protected by Global Protect [closed]

What am I running? EC2 instance Ubuntu 22.04 with a static elastic ip address The instance has only one network interface, whose details say it is an Elastic network interface. (I believed every ...
  • 101
-1 votes
0 answers
16 views

Why when do I use "nslookup" with an IP address, it returns always a kind of server name and not the name of the web site? [closed]

if I type "nslookup www.youtube.it" my terminal returns: Non-authoritative answer: Name: youtube-ui.l.google.com Addresses: 2a00:1450:4002:410::200e 2a00:1450:4002:411::200e ...
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1 vote
1 answer
15 views

Running 2 or more applications PPP

I had a doubt regarding point-to-point protocol. Is it possible for a single PPP link to enable running of 2 or more simultaneous applications between two hosts? Thanks!
  • 13
0 votes
0 answers
15 views

How is NAT Port Exhaustion handled? [closed]

"Port address translation (PAT) resolves conflicts that arise when multiple hosts happen to use the same source port number to establish different external connections at the same time. PAT may ...
1 vote
2 answers
32 views

Best way to configure for port forwarding

I am using a Peplink Balance 30 router. Right now I have only one public IP. I have set up the LAN for 192.168.8.1. I have five devices on the LAN side, including two Ubiquiti Rockets and three IP ...
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0 votes
0 answers
9 views

AODV destination sequence number when its increment [closed]

Help to understand AODV Destination sequence numbers also when its increment.
1 vote
1 answer
24 views

How to define packet loss

I found that "Packet loss describes lost packets of data not reaching their destination after being transmitted across a network." So, we can say that it is a portion of transmitted packets ...
0 votes
1 answer
26 views

How does policing prevent LLQ queue starvation? (QoS)

A networking course that I follow mentions the following information about LLQ (Low Latency Queuing) in QoS LLQ designates one (or more) queues as strict priority queues. This means that if there is ...
  • 415
0 votes
0 answers
15 views

Network exercise [closed]

Your company has a video transcoder. Each network interface returns the number of transmitted and received octets at a precise moment. The bitrates need to be added to the transcoder. Calculate the ...
0 votes
1 answer
35 views

Is the RJ45 boot part of the RJ45 design specification?

Like tabs vs spaces, or Pokémon vs Digimon, the RJ45 boot is arguably a cause of controversy for many. Is it, however, in the official design specification for the RJ45 connector, or is it a non-...
0 votes
0 answers
12 views

Access a local network remotely [closed]

I have the following problem, there is a client with a local web application without internet access, I put a mobile modem to provide access but I cannot communicate with the modem or with the local ...
0 votes
0 answers
25 views

Windows 11 connects to separate untagged and vlan tagged network at the same time - how do I make it stop? [closed]

I have a Windows 11 Pro machine 22H2 plugged into a network port that provides untagged network access, and a tagged VLAN for phones advertised using lldp-med. My expectation is that Windows, in ...
0 votes
0 answers
13 views

How to minimize the Margin of error in NTP chrony [closed]

I have an NTP client where I am using chrony and sync with the NTP server. I want to ask How to minimize the margin of error to micro seconds which is right now +/- 39ms.
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0 votes
0 answers
7 views

Wireshark mentions a malformed packet in the NTP part, how should I handle this? [closed]

I'm creating a C# TCP-socket based application, and I'm testing it, using Hercules, a communication I found on the internet. I have following line of code, which sends a message over a TCP connection: ...
  • 131
0 votes
1 answer
15 views

Where are the characters in Wireshark's Packet Bytes pane?

I've just updated my Wireshark to version 4.0.1, and now, while investigating a TCP communication, I don't see any textual information anymore in the Packet Bytes pane, as you can see from this ...
  • 131
2 votes
1 answer
21 views

Cisco NGFW FTD NAT/PAT pool exhaustion monitoring

We have a customer, who rarely experiences NAT/PAT pool exhaustion on their Cisco Firepower NGFW 4110. While syslog will helpfully notify us that there's an immediate problem, we would really like to ...
  • 1,720
0 votes
3 answers
53 views

DNS Servers and Host Names

I was studying how to set up DNS on a Cisco router, and I got confused on this piece that stated: "Next step is to configure your DNS server with the host names of your local network, this way ...
0 votes
0 answers
8 views

Getting error "the specified gateway ip address is not valid" when trying to set up a static route on Linksys mesh router [closed]

I'm trying to set up a static route on a Linksys mesh router (WHWO3V2) and either I don't understand what I'm doing (possible), or the validation script is bad/wrong. Network Details: The LAN (wired) ...
  • 101
0 votes
0 answers
16 views

ip address 169.254.xxx.xxx if connection of a device via switch [closed]

All: my notebook is connected via WIFI with my router and has a valid IP-address 194.168.178.xxx. A switch (TP-LINK TL-SG1016) is connected (via LAN) to the ethernet port of my notebook and another ...
  • 1
3 votes
1 answer
380 views

Are all 64 DSCP values usable/configurable?

I have read that DSCP consists of 6 bits, thus providing us with 64 DSCP marking values (0-63). If I understood all correctly, 21 of these values have been standardized and named (AF, EF, DF, etc) ...
  • 415
0 votes
0 answers
20 views

Are 1-button call transfers possible? VoIP provider says no [closed]

We'd like to have 1-button call transfers, for example: press 1 - transfer to person A press 2 - transer to person B What we have instead is: **number - attended transfer ##number - blind transfer ...
0 votes
1 answer
15 views

Juniper EX2200-CX - Internet connectivity [closed]

I just purchased a used/good EX2200. I want to enable routing so that the device can get NTP updates. My GW address is 192.168.1.1. I need a little help with a configuration that gets me Internet ...
1 vote
1 answer
28 views

How do you redirect Fortigate packet sniffer CLI output to a log file?

I want to run the fortigate packet sniffer: https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Using-the-FortiOS-built-in-packet-sniffer/ta-p/194222 and when I do so, I only get CLI ...
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5 votes
2 answers
394 views

What does 'moving packets away from the source' in RPF means?

I recently started studying multicast and I am a bit confused by how reverse path forwarding is explained. Most of the sources describe RPF as 'moving packets away from the source' but I understand ...
  • 83
0 votes
1 answer
17 views

FPC ACX2100 high CPU (99%)

I have an ACX2100 with high CPU usage in all FPCs. juniper@ME-CSR-HNI_CGY-C100.1> show chassis fpc Temp CPU Utilization (%) Memory Utilization (%) Slot State (...
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0 votes
1 answer
40 views

Packet tracer is changing my addresses ipv4

Could someone help me with this? I have a subnet with the ip: 172.16.193.0 in the fastethernet 0/0 of my router and when I go to put it in RIP the Packet tracer is changing it for another ip:172.16.0....
0 votes
0 answers
29 views

Why do servers in a data center need to communicate with eachother? [closed]

A networking course that I follow briefly mentions the Spine-Leaf architecture used in data centers. It was mentioned that prior to the Spine-Leaf architecture design, the 3-tier design (access - ...
  • 415
0 votes
0 answers
11 views

Connecting VLANs between a permanent router and a portable one [closed]

I am looking for some help with a routing scenario that is probably pretty unique. I feel like it is possible, but can't quite figure out best way to tackle it. We have two networks as described ...
0 votes
0 answers
12 views

Configuring home router with public IP adress [closed]

I got 196.188.173.32/30 ip adress from my ISP with the following configuration. Wan ip : 10.126.10.158/29 Gateway : 10.12.10.157 Lan Ip : 196.188.173.32/30 I have configured the router per ...
  • 103
0 votes
0 answers
17 views

Suspicious activity seen on network after unknown device joins [closed]

To cut to the chase I'm a little concerned about network activity related to the following (any sensitive information redacted). It appears as though an unknown legacy (?) device joins my network, ...
0 votes
2 answers
41 views

What's the difference between host routes and network routes for layer 2 destination selection?

This problem usually occurs with servers, but the question itself is about network. When I have a gateway with 10.1.1.1 and an interface with /24 network, the network routes are automatically ...
  • 55
0 votes
1 answer
23 views

Is a port channel necessary between redundant core switches?

A course I am following mentions some examples and basics of network design, which includes the 2-tier/3-tier campus LAN designs. About the 3-tier design Would a port channel be necessary between C1 ...
  • 415
0 votes
0 answers
14 views

Is it possible to set maximum 32 PAT translations per global ip address?

So basically I'm trying to configure a cisco router (c7200) to use PAT with a pool of global addresses, and each global address should only support a maximum of 32 private addresses. I've been ...
1 vote
2 answers
54 views

What components of a network switch qualify as ASICs?

While studying for CCNA, I came across the information that in a network device, say a switch, the CPU is responsible for the control and management planes work, while the actual data forwarding is ...
  • 83
0 votes
1 answer
21 views

Pushing Data in TCP and flow control

When TCP uses PUSH to send packets one after the other, is flow control required?
0 votes
1 answer
22 views

Can SneakerNet Consider As Network?

As the title of the question, is that sneakernet can consider as a network? Or a network is the devices must be connected via cable or wireless?
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0 votes
1 answer
44 views

How to properly configure OSPF protocol?

I have this simple 3 router network that I need to configure the OSPF for, when using two routers every thing works fine and i can ping but when I add the third router nothing works left router ...
0 votes
0 answers
9 views

what is the hop forwarding address for a subnet? [closed]

The router would have an entry in the router table like this destination address: 128.32.1.0 subnet mask: 255.255.255.0 But what would be the forwarding address in this case? What address does it ...
0 votes
0 answers
8 views

Do I send entire domain to TLD in request? [closed]

Suppose I want a.b.c.d.com to be resolved. Does the TLD (com) only receive a request for d.com, or do I just ask for a.b.c.d.com in the hope the full domain is cached? Is it a recursive DNS client ...

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