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1500 questions
6
votes
2 answers
Ethernet padding
I'm using Wireshark for my project. I sent a ping over to Google.com and Wireshark said that the length was 57 bytes(when I received the reply it was 60 bytes long and it contained 6 bits of padding.
After I decided to send another packet that…
user35754
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6
votes
2 answers
Full Duplex and Collision Domain
I have a very basic query on Collision Domain and Full Duplex Mode. There are two types of logical topology: Ethernet and Token Ring .
Whenever we read about Ethernet the first thing that we are taught is CSMA/CD. It says that in Ethernet two…
Pratyush
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6
votes
1 answer
Why doesnt Bluetooth Low Energy interfere with Wifi
so the BLE advertising channels are located at 2402Mhz, 2426Mhz and 2480Mhz.
That is so it does not interfere with the 3 wifi channels in the 2.4Ghz band.
My question is especially about the 2426Mhz advertising channel. Wifi channel 6 ranges from…
User Name
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6
votes
1 answer
Responsibility of the physical sublayers of Ethernet
I'm learning about Ethernet and the sources I've found seem to be controversial regarding the role of the physical sublayers of Ethernet displayed on the following image.
Just to mention an example for that: the…
francesco
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6
votes
2 answers
How to properly name TIA-606-B Cabling Subsystem 1 far end identifier for work area equipment outlets?
We are moving to TIA-606-B for labeling. I have read most of the TIA-606-B standard. Some parts I have only skimmed, while others I have studied in depth.
I do not understand the rationale behind the identifiers for Cabling Subsystem 1 links…
Xevious
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6
votes
1 answer
Cisco HSRP CAM vs ARP timeout
Today we received email from our ISP saying they are performing maintenance on their network so if you have HSRP connectivity with them in that case you need to clear ARP table or reduce ARP timeout
We do have HSRP connectivity with our ISP and…
Satish
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6
votes
2 answers
What considerations should be made when determining whether to use the BGP "network" command vs Redistribution?
BGP has three ways to advertise a route:
network command
redistribute command
Aggregation
There are two reasons I've come across for using the network command vs the redistribute command:
1.
The network command advertises routes with an origin…
Eddie
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6
votes
5 answers
Different subnets in the same LAN
I have a very rudimentary doubt. We know that a LAN has addresses in the same subnet.
The LAN ends at the gateway router with that interface also belonging to the same subnet.
But what exactly will break in the forwarding operation if we assign LAN…
john
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6
votes
1 answer
Cisco CatOS - show port usage output
I'm in the process of replacing some switch blades and i'm looking through the show port usage command on the older catos switches.
I'm struggling to understand the output for the show port usage command
(enable) show port usage 6/47
Port Status …
Oli
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6
votes
1 answer
Zyxel USG100. GS1910 Vlans cannot access wan
Iam trying to configure a network that looks like this:
My Vlans and static routing seams to work fine, i am able to ping between the VLANs. My problem is, when i try to make a connection to the internet, I get a time out when trying to ping, i am…
Rune Jensen
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6
votes
1 answer
Filter ARP packets with specific "Who has" and "Tell" IP
Here is an ARP packet:
192.168.1.3 ARP 62 Who has 192.168.1.1? Tell 192.168.1.2
How to display only ARP packets with
1) specific "Who has" IP (192.168.1.1 here)?
2) specific "Tell" IP (192.168.1.2 here)?
user207114
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6
votes
1 answer
What should a device do with an Ethernet frame larger than its MTU?
When I test with Cisco 2960 series switches or with ISR routers, then if port receives an Ethernet frame larger than its MTU value seen in sh int output, then device drops this frame and increases the giants counter. In my opinion this is an…
Martin
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6
votes
1 answer
HSRP and Static NAT behavior
May I have your opinion on the following matter?
Configuration:
Two 2911 routers.
Doing HSRP on Wan and LAN side with 2 standby groups.
Doing static NAT to internal servers.
Added redundacy keyword on the nat statements .
Tracking wan side interface…
Tsubasa
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6
votes
5 answers
Do we really need ARP when only hubs are used to connect devices?
In the case only hubs are used to connect devices do we need ARP?
Packets will be forwarded to every device. So, when a packet whose destination IP doest does not match with the device IP, it will be discarded.
In such a scenario I believe that it…
gaetano
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6
votes
1 answer
SRX100 in bootloop. Flash storage problem?
About a month ago one of my SRX100 started to go into a bootloop for no obvious reason to me.
After some hours, it eventually stopped and booted up the system again (primary) and I was happy that I could create a rescue config. However, I did not…
xeet
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