Questions tagged [layer3]
For questions about the OSI layer-3 (network layer).
333 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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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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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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When a layer 3 switch or a switch with SVI receives a broadcast frame, does the switch decapsulate the frame?
When a layer 3 switch or a switch with SVI receives a broadcast frame, does the switch decapsulate the frame? I was confused on this. I was playing with packet tracer trying to get a better ...
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Nested Fragmentation [duplicate]
If fragmentation only occurs once I can reassemble the package, what if the package is fragmented more than once
For example, a package of 3000 bytes will be sent via an Ethernet MTU link of 1500 ...
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Connectivity between two switches [closed]
We have existing setup of manageable juniper switches with two vlans, one for door access and other for the CCTV. One of our switch gets faulty. Could I add unmanageable (Ubiquity) (plug and play ) ...
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Question about layer 2 systems on the internet
this is a follow up question for an answer on a previous post I made (mod deleted it so I can’t reply on the post):
I made a post about arp being pointless
in router to router communication in the ...
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IEEE 802.11s Mesh: IP Address to MAC Correlation?
I'm attempting to better understand IEEE 802.11s wireless mesh networks and I don't understand how IP addresses are correlated to MAC addresses if the mesh channel has a different MAC address than the ...
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Core Switches Redundancy Problem
I have network. I have three different networks and 2 vlans. PC0 is a member of vlan 10, PC1 is a member of vlan 20. One of the networks for vlan 10, another one is for vlan 20, third network is for ...
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TCP/IP and data cut
I would like to clarify my understand about TCP/IP model and packet cutting. I think it's done by layer 3 (Transport, eg. TCP) but I'm note sure about layer 2 (Network, eg. IP) or even layer 1 (...
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Layer 2 Encapsulation and Decapsulation in Router
Whenever the router receive a packet from the local network, router will decapsulate the frame to be able access the IP information, after router have done know which interface it will send the data ...
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Layer 3 switch SVI and static ip confusion
I have not configured the network yet. Every vlan will have a different subnet. I want to assign ip addresses to the switches on the network from another subnet. How can i provide a default gateway ...
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Layer 3 Switch IP Problem on Packet Tracer
I set up a network. It contains vlans. I assigned devices ip addresses from different subnets. I have 2 layer 3 switches to communicate them. I assigned switches ip addresses from different subnet. I ...
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How can a router not recognize a gratuitous ARP MITM attack?
I'm reading the chapter for DHCP Snooping/DAI in the OCG for the CCNA and I have a question regarding how gratuitous ARP message attacks work.
I'm sure there is a piece I am missing, but I've searched ...
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How does L2 switch forward tagged VLAN?
I am a student of networking and have a question. I am currently doing an internship / project at a school where they have 3 buildings. I will name them for now
A (subnet 172.16.x.x) --> Each with ...
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