Questions tagged [layer2]
For questions about the OSI layer-2 (data-link layer).
416 questions
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How to build a redundant network using MOXA switches and MOXA routers (Turbo Ring + VRRP)?
How can I build a fully redundant network architecture using two MOXA RKS-G4028 switches and two MOXA EDR-G902 routers?
I have two MOXA RKS-G4028 switches and two MOXA EDR-G902 routers. I need to ...
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How to configure VLANs on MOXA RKS-G4028 to control server-to-server communication selectively
I am working with a MOXA RKS-G4028 managed L2 switch and I want to set up multiple VLANs to control communication between servers. My goal is to configure 4 VLANs (VLAN ID: 10, 20, 30, 40), each ...
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Why does a (default) gateway use a layer 3 address?
It seems to me that it would make a lot more sense to specify a default gateway with a layer 2 address.
As I understand it, the default gateway is only used to find which MAC address should be filled ...
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Primary VTP server protection
Vtp domain has 1 server: SW-A. SW-A is done version 3 and SW-A# vtp primary. An attacker brings his switch (SW-B) with bigger revision number than primary server and connect it to network. And get all ...
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Can I perform inter-VLAN routing on a Layer 3 switch using a single trunk cable connected to an unmanaged Layer 2 switch?
My scenario: I have many endpoints currently connected to an unmanaged switch. I want to add Layer 3 switch and segment the network into VLANs, but I'd like to avoid the manual work of tracing which ...
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Switch internal layout
Tanenbaum's Computer Networks book has nice schematic drawings of hubs vs switches.
I wonder why he draws a full grid for the switch. In my understanding the green stuff (my addition) would be enough?
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Bit Ordering in Bluetooth Low Energy (BLE) Link Layer Packets
As part of a project, I am trying to simulate the link layer packet generation of the Bluetooth Low Energy (BLE) standard version 5.4, with the specification found here. What's relevant to my current ...
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Unknown MAC address data frame flooding by switch
Let's say switch A has 2 switches connected at port 2 & port 4. There are a total of 8 ports.
With time, it knows the MAC address of other devices connected to it.
Now, the device on port 1 wants ...
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Can you multiplex 5+ ethernet lines such that one of those is selected mechanically or by detection of a signal on that line?
Hi all I'm a relatively new electrical engineer who's been asked to take 5 Cat 5 data lines and feed them to a hub which selects one of them upon receiving data in that line to send to a computer. As ...
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Design question to fetch L2 traffic with sFlow
I need some advice about L2 traffic fetching.
Here's the situation :
I got 2 datacenters where both core switch (Cisco Nexus9000 C93240) are linked each other through a 1GB/s vPC where our VLANs are ...
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2 Firepower 1120 Firewalls connected to a layer-2 switch
I am working 2 cisco firepower 1120 firewalls, which are connected to a 5-port layer-2 switch through their "outside"(Ethernet1/1) interfaces, each with an IP address of the form 192.168.1.x ...
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Propagation of multicast frames used for networking protocols (e.g., stp, lldp)
I'm looking for proper resources on how frames with multicast destination mac addresses, specifically those used for networking protocols such as STP, are propagated within a layer 2 domain.
For ...
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MTU & Fragmentation
MTU Specify how many byte we can send through the link
In the Ethernet link the mtu is 1500 byte
My question is :
(1).Can we send a data less then the mtu ?
(2). if I'm sending data with a size 1300 ...
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lacp on two dark fiber provider with different span
We have two dark fiber connections from two different providers, Provider A and Provider B. The span for Provider A is 20 km, and the span for Provider B is 25 km. I want to know if I can use QSFP28-...
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Question about the way networks are described vs their modern implementations
I am a networking student and I am currently pursuing my CCNA. I am primarily enrolled in the Cisco NetAcad.
My question is in regards to how certain networks are described in these courses compared ...
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