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1500 questions
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2 answers

Does Cisco *ip dhcp snooping limit rate* apply if DHCP snooping is not configured for the access VLAN?

Came across a situation where DHCP snooping was enabled on a Cisco switch, but only for certain VLANs. However, all access ports had a ip dhcp snooping limit rate 15 applied whether or not DHCP snooping was configured for the assigned access…
YLearn
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4 answers

ASA 5505 remote access VPN - Connection established, but no internet/access to internal subnet

Update Finally got upgraded to 9.1.4. I got everything configured, reenabled VPN, and was still having the same problem. So, I cleared all VPN config information and started from scratch. Below is my current config. I am able to connect and access…
mikeazo
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3 answers

How can ISPs on one continent connect to ISPs on another continent?

How can ISPs on one continent connect to ISPs on another continent? From a physical layer standpoint? Say one ISP is located in Asia and another one in Europe how would they connect their fiber optic cable to exchange traffic? Also how would they…
chris
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10
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1 answer

Configuring HSRP on Nexus OS

How do you configure HSRP on a Nexus 7000 series switch? I know in IOS the commands are in the interface configuration, for example: switch-a#config t switch-a(config)#interface g1/0/1 switch-a(config-if)#ip address 10.1.1.2…
Brett Lykins
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10
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3 answers

What is the relationship between the bandwith on a wire and the frequency?

I am trying to learn networking (currently Link - Physical Layer); this is self-study. I am very confused about one particular thing: Suppose I want to send a data on the wire something like this: 01010101, where it will look some thing like this…
Koray Tugay
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10
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1 answer

Cisco WLC External WebAuth Apparent Random Behavior

On Cisco 5508 v7.2.103.0, I have a couple of WLANs configured. Call them ABC and XYZ for the sake of this question. ABC uses 802.1X and gets a splash page redirect URL pushed down. XYZ uses PSK and uses the WebAuth external config to push a login…
generalnetworkerror
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3 answers

How HTTP is converted to TCP and then how TCP converted to IP?

I know that in Internet Protocol Stack there are actually three layer. They are Application, Internet and Transport. Let's say HTTP in Application layer will be converted to TCP in Transport layer and TCP will be converted to IP in Internet…
RajeshKannan
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3 answers

Does anycast addressing add additional latency in any way?

Does anycast addressing, in itself, add any additional latency to network connections? Specifically, if you had two servers located in the same data center that had extremely similar routes/number of hops in route, up until the actual destination,…
rickjerrity
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2 answers

Appropriate certificate to ask for a fibre installation (ANSI/TIA-568.3-D?)

I am getting a subcontracting company to provide terminated fibre connections between two points, and I want to say what they are expected to do and what certificate they are expected to supply. This is intended to cover mistermination, damaged…
jonathanjo
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10
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6 answers

Do I need to protect SFP ports and optics from dust/contaminants? If so, how?

I have a used switch with some SFP ports and some SFP modules installed, which I don't use. All new switches come with little rubbery bungs that block up unused SFP ports, but since this old procurve was in use, those bungs are gone. 1) Do I need to…
Criggie
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2 answers

Why does my Cisco 6509 BGP table use two entries in my TCAM?

I have a problem on my Cisco 6509, each entry in my BGP table occupies two entries in the TCAM. If I show capacity forwarding, I see MPLS entries in L3 forwarding resources. But, I do not use MPLS on my chassis ! #show run | i mpls mls cef…
Johann M.
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10
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2 answers

What is IP squat space

I came across this article and I'm trying to understand what is going on here, I found some packets on my network containing 22.0.0.0/8 and 29.0.0.0/8 IP range and It's based on: https://en.wikipedia.org/wiki/List_of_assigned_/8_IPv4_address_blocks…
Satish
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10
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4 answers

Should spanning tree path costs match on a physical link?

While working on a set of switches I noticed that the spanning tree path costs aren't set up to match on opposite sides of the same physical link. For some reason that doesn't look right to me. Shouldn't the same link be set with the same path cost?…
Tim Brigham
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4 answers

Does every host on the LAN share the same ARP table, or do hosts keep them individually?

I'm just learning about ARP. I'm a little bit confused. My confusion is better explained in a scenario. Host A is communicating with Host B. Host A knows Host B's IP address, but not it's MAC address. Therefore, it send an ARP request to the LAN and…
brennvo
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3 answers

Traceroute Over TCP vs UDP

For what purpose would one wish to send traceroute over TCP rather than UDP? What advantages/disadvantages are there in doing so? I know that traceroute normally uses UDP ICMP "echo" packets while traceroute with TCP uses "SYN" packets from its…
THE DOCTOR
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