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1500 questions
7
votes
1 answer
Mixing Cisco STP Features: BPDU Guard, BPDU Filter, PortFast and PortFast Trunk
I have two switches (Cisco 2960's) with a trunk between them (two ports in an ether-channel) and each has a trunk up to a separate router, all other switch ports are access ports to end devices;
R1 R2
| |
| |
| |
SW1 ===…
jwbensley
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7
votes
1 answer
Why is the IPv6 link-local address range a /10 rather than e.g. /12 or /16?
I'm currently studying for my CompTIA Network+ Exam and am a bit confused as to why the IPv6 link-local address is a /10 and not a /12 or /16. Since each character in an IPv6 address is 4-bits and each section of a IPv6 address contains 4…
ahelton
- 131
- 8
7
votes
1 answer
Mitigating a IPv6 malformed packet multicast flood
So we just had our first IPv6 multicast flood in the network this morning.
We managed to stop the offending computer by blocking the mac address with:
mac-address-table static x.x.x vlan x drop
Before we blocked the mac address we started a…
mastrboy
- 505
- 4
- 11
7
votes
3 answers
Is there any reason to use a hub over a switch?
Given that hubs are essentially the same as switches, as far as I know, except they share bandwidth between all connected devices, while switches do not, resulting in faster connections. I am simply wondering if there is any reasonable purpose for…
Ashtin Blanchard
- 73
- 1
- 3
7
votes
2 answers
Can Junos show a matching config statement in context, like IOS `| section`?
Hard to describe what I'm asking.
For example, here's a section of my config, with the full hierarchy:
interfaces {
ge-0/1/9 {
vlan-tagging;
unit 100 {
description "my cool interface";
vlan-id 100;
…
Jacktose
- 476
- 4
- 22
7
votes
2 answers
Dell PowerConnect 5524 VLAN routing
I have a Dell PowerConnect 5524 that I'm trying to configure.
What I want is simple routing between VLANs and the user guide is less than helpful.
On page 220, it says (or implies) that all you need to do to have routing enabled between two VLANs is…
Sean Airey
- 233
- 2
- 10
7
votes
6 answers
Why do we need FTP when there are layers to transmit data?
In OSI, there are layers for routing, encapsulating and transmitting the data. Then why do we need FTP?
I read the following definition of FTP in books:
FTP is used for transferring files on networks. It isn't just a protocol; its also a program.…
Shashank Barthwal
- 299
- 4
- 10
7
votes
3 answers
How does NAT decide which connections are inbound, and which are outbound?
I'm building a P2P application that needs to be able to access nodes behind a NAT. This NAT does not allow inbound connections, therefore the nodes outside the network cannot reach out to the nodes behind the NAT.
My solution to this problem is that…
Dean M.
- 73
- 1
- 6
7
votes
1 answer
Router benefits in 2018 compared to a L3 Switch
What are the benefits nowadays to use a Router instead of a L3 Switch ?
bdes31
- 1,085
- 8
- 15
7
votes
3 answers
Do low temperatures cause problems installing new optical wiring or fixing broken optical cables by splicing?
One of our supplier reported big problems splicing (using this) a broken outdoor optical fiber cable when temperatures around or little bellow freezing point. They refuse to install new optical fiber wires when temperatures are not well above zero…
Vojtěch Dohnal
- 276
- 2
- 11
7
votes
3 answers
Difference between default route, partial and full routing table for a BGP session
What is the difference between default route, partial and full routing table for a BGP session? Does it affect the routes bird (or another BGP client connected to the session) sees?
Matthias Merkel
- 587
- 2
- 6
- 11
7
votes
5 answers
Why does NAT translate a source port?
I’m beginning to learn about nat and I was wondering why does NAT translate a source port? Doesn’t a port represent an application that’s requesting a service? So why must it be translated? Also what would happen if NAT hypothetically didn’t…
Jaffa
- 71
- 1
- 1
- 2
7
votes
1 answer
Cisco IOS Tcl - Overhead
I've not been able to find much in regards to TCL other than the Cisco PDF "Cisco IOS Scripting with TCL Configuration Guide" and I just have a few queries.
I'm looking into potentially utilising this for pinging a range of addresses withing a…
matthew walker
- 73
- 3
7
votes
3 answers
What are the components and licensing of a full Cisco CUCME PBX?
I've been placed in charge of replacing an older Avaya TDM PBX with a new VoIP system that will integrate with Exchange (at least in the capability to transcribe voicemail messages and deliver them to the email inbox).
I recently acquired the CCNA…
WaxTrax
- 941
- 8
- 19
7
votes
2 answers
is there a difference between Latency and speed ?
so latency is the time it takes for bits to get from the sender to the receiver
and the speed is how fast bits travel , so logically the more speed the network has the more low latency it has also , but why are people saying
that Satellite…
justin
- 139
- 5