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1500 questions
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UDLD in VSS configurations

Since a VSS is a single system image, does it make sense to enable UDLD for links between the switch pair? We've seen some recovery problems that we feel might be due to UDLD mistakenly identifying an ISL link as unidirectional, especially in a…
JPFlathead
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6 answers

Bandwidth vs Throughput vs Data(bit) rate

I totally understand the difference between bandwidth and throughput. While bandwidth shows the maximum amount of data can be transmitted from a sender to a receiver, throughput is the actual amount of data that has been transmitted as they could be…
Nara
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How are the hosts in the tracert 216.81.59.173 able to use random domain names?

How are the host names in this trace route able to use random top level domains? I didn't know there was an 'Empire' or 'victory' top level domain. C:\Users\Chloe> tracert 216.81.59.173 Tracing route to read.more.at.beaglenetworks.net…
Chloe
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5 answers

What is the reason for T568A and T568B termination?

There are two types of pinouts for terminating twisted pair cable with a 8P8C (RJ45) connector: But why must one not simply align the wires serially, e.g: Green pair - Orange pair - Blue pair - Brown pair Why do the current standards offer a…
Alexander Gonchiy
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2 answers

Can I truly multicast over WIFI?

Am streaming UDP over wifi (5ghz) - approx 1.5k/packet... trying to stream to ~10 devices simultaneously, with extremely low latency.. As I understand Wifi, it can never true multicast, as each device holds a '1:1" relationship with the AP, and then…
frank ankersly
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12
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1 answer

IEC or SI units (binary prefixes) used for network measurement?

What are the correct usage guidelines for SI and IEC binary prefixes when using decimal (power of 10) units of measurement relating to computer networking and binary (power of 2) units of measurement (data transfer in particular, but also file size)…
Baldrick
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3 answers

Why do we need MAC Address if we can uniquely identify each machine with an IP Address

I learnt that in ARP Protocol, to send a packet from one machine to another machine we need to know the MAC Address of the destination machine but since the destination has already been assigned a unique IP Address then isn't sending MAC Address…
Shivam Aggarwal
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2 answers

Error: `EIGRP is restricted to stub configurations only on this platform`

We just bought some new Cat4507R+E distribution switches. When we bought the switches, we asked for an Advanced Services K9 image, but our reseller told us they only come with a Universal K9 image. I didn't know better, so I said OK. However, when…
user2561
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4 answers

VRFs, VLANs and subnets: difference

I have a basic understanding of VRFs, VLANs and subnets. I understand that VLANs operate on L2, and subnets and VRFs (lite) on L3. What I don't understand, is why you would choose one over the other when you mostly care about segmentation. Imagine…
Michael
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2 answers

How can a processor handle 10 Gigabit per second or more data rate?

I do not know if it is the right place to ask. It may be a very silly question. I assume that some processor has to process data frames for switching/routing. Modern processors have speed of few GHz. How do they handle data that is coming at a rate…
Ibraheem Moosa
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1 answer

Translating SNMPWALK output into human-readable format

I am asking this question which is related to a question I previously asked and was comprehensively answered by @MikePennington. When I asked that question, I intended to know how to poll arp table from a switch, but in his answer, he included mac…
sosytee
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2 answers

Can I use Cisco Anyconnect with mobile devices?

I've got a lot of clients with mobile devices that want to connect to our corporate network which uses Cisco Anyconnect. How can my clients connect to our VPN using a mobile device?
Lucas Kauffman
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1 answer

Cisco ASA: What is the "tx hangs" counter on show interface?

Consider the following output from show interface: Interface GigabitEthernet0/1 "inside", is up, line protocol is up Hardware is i82546GB rev03, BW 1000 Mbps, DLY 10 usec Full-Duplex(Full-duplex), 1000 Mbps(1000 Mbps) Input flow control is…
tunnelsup
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2 answers

Directed and Limited Broadcast confusion

Let's say I am on a network 192.168.1.X and I use the below ping commands. ping 255.255.255.255 ping 192.168.1.255 Why we are calling 1st one as limited and 2nd one as directed ? In what category does the below will come ? ping 10.X.X.X X is…
user2677679
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2 answers

Port mirroring on an HP Switch (HP 2915-8G)

for sniffing purposes I need to mirror traffic on an HP 2915. How would I go about doing so?
Max
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