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1500 questions
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2 answers

Should I disable STP on my access ports?

I'm going to replace some old "central" access switches to some Cisco Catalyst 2960X, and I'm not sure what to do on their STP configurations. For this network, we have some "central" access switches, that connect some hosts and some unknown…
Maurício Mota
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STP Packet on specific interface eth1

I have an issue related to some stp packet that being sent every 1 or 2 second on my server interface eth1. This interface is connected to my stack switch, and the port is in a public vlan. Here is the output I have from the…
upitnik
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1 answer

Traceroute to an internet address when I'm behind a Dynamic-PAT firewall?

Consider this network diagram: In this scenario, the router is performing "Dynamic PAT" (I'm using Cisco's definition) where all "real" or "inside" addresses are mapped to a single outside address provided by my ISP. Can host 192.168.1.20…
alx9r
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2 answers

In and Outbound Dual VRRP connections

I'm trying to setup a redundant route link for our internal network using brocade layer 3 switches. I have setup up VRRP on both the green/blue and red/black networks. The reason for doing this is to simulate an active passive pairing. I thought…
krizzo
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Why is the IPv6 link-local address range fe80::/10 rather than fe80::/64?

RFC 4291 specifies that IPv6 link-local unicast addresses must have a high-order bit sequence of 1111111010, or fe80::/10. However, the same document specifies that the 54 bits following the first 10 bits are zeros: Link-Local addresses are for use…
Ted Quanstrom
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6
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1 answer

Mobile devices behind wireless bridge not getting IP address

I'm trying to get a wireless link set up to a building about 1/2 mile away from the rest of my network. I'm using a pair of Engenius EOC2611P radios, and as far as I can tell everything is set up correctly. While in the remote building, my laptop…
Joel Coehoorn
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6
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3 answers

The Difference between session and flow in networks

What is the difference between session and flow in networks? In fact, I always visualize flow as a set of packets having the same source and destination. What confuses me is session. So I'd like to know the difference. Thank you
Katherine
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Why is there reserved bit or byte in network protocols?

In different wire protocols there is often a set of reserved bits that must be set to 0 or else the connection is ended. What is the purpose of such reserved bits? When was the last time these were actually used in 'future'? If other machine is…
Muhammad Hasan Khan
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Difference between gateway, router, switches and bridge

I am going through a course of networking and want to know the difference between the mentioned devices. I have heard that the switches: Establish a temporary connection between the devices connected to it and wanting to communicate. If this is the…
Pranav
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1 answer

WLC geographical redundancy

There are two "central" locations each one having one satellite or spoke site. Let's have: - zone A and its spoke_zone A1 - zone E and its spoke_zone E1. Both region A and region E have a similar deployment scenarios: - 1 x 5508 WLC - several LWAPs…
laf
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3 answers

Circuit and Packet Switching

I'm struggling to understand 1 or 2 things about packet and circuit switching. In circuit switching, resources are not shared and a it's guaranteed full capacity to the call right? They are "reserved" for a certain call/circuit. But in TDM aren't…
tsm
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6
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1 answer

Wireless (Ruckus) and Dynamic VLAN Assignment via Microsoft NPS

Our current 802.11 setup has a large number of SSIDs to segregate traffic by subnet. This isn't ideal, and I've been attempting to consolidate to a single SSID but use dynamic VLANs instead. This is on a Ruckus Zonedirector 3000 and Microsoft NPS as…
Network Canuck
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Does a router have multiple nics?

I am currently doing an internship and I hear the IT Director referring to a router port as a NIC. I can't remember exactly what he said. Also, in my Networking+ book it states that each dynamic routing protocols are tied to individual NICs, not the…
Dalton55
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6 answers

Solution for network inventory?

I am trying to figure out a way to keep track of network equipment, including chassis and service modules/line cards. So when I need to find something, I know where I can find it. 1) telnet access available 2) IOS, IOS-XE, IOS-XR, NX-OS, ASA I am…
sdaffa23fdsf
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TCP Flow-control questions that drives me mad

This is a capture of a TCP session when I was downloading the 10Mb file from an FTP server. The server has an ICW of 10x MSS, so this means that the server can initially send 10 segments without receiving an ACK from the client. Being said that,…
mohmkamal
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