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Closed 4 years ago.
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I was going through Russell's SS7 guide and was wondering what are SSP actually . Are these the telephone boxes we see on our streets or are they present inside telephone exchanges .
According to "Lan Tutorial With Glossary of Terms: A Complete Introduction to Local Area Networks (Lan Networking Library)" April, 1996:
SS7 messages originate at an SSP [Service Switching Point], which is a telephone switch that places or receives a call. The SSP is usually found at a telco's central office, but SS7 messages may also be used by an enterprise PBX. An ISDN PRI's D channel can also send messages that are compatible with SS7.
So not the little boxes, usually.
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Closed 12 months ago.
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I am studying for my CCNA, and I was wondering why we can't route packets between networks with MAC addresses. I have looked at other questions, and I can't seem to find the answer to this.
Because that would mean that every node in the network would have to know every mac address everywhere
think of it like this. IP routing is like routing by postal address
123 main st,
Big City
Ohio
USA
This is structured. Post office in California (where I mail this letter) doesnt know about 'main st' at all, but it knows to send to 'Big City' sorting office. They will know
MAC address is just a random number. That would be like mailing using SSN
Imagine a letter that said simply
354-76-8791
as the address, where would the post office send it when I mail it. They would need a registry of every SSN and where they live, updated all the time.
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Closed 1 year ago.
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I'm beginner at networking, I notice that after configuring a network when I try to test the network connectivity with sending msg every time at the first attempt It always says "Failed" and then it says "successful" . what is the reason ?
when you try to ping the device, the first packet will fail. that time it will initiate the packet for the first time.
1). your MAC address table does not have destination Addresses.
2). Routing entry will not there.
after finding the destination of the device it will flow the packet without failure.
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Closed 5 years ago.
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Obviously the difference is that one can and one cannot access Netflix. But how does Netflix ban VPNs while not catching VPNs designed specifically to access Netflix?
The main difference is the question of whether Netflix knows about them yet or not.
In time, the VPNs which can access Netflix today will likely end up being blocked by from accessing the service when Netflix's analysis of incoming connections reveals IP addresses which could belong to VPNs used to circumvent their restrictions.
It is possible that some operators of VPN services may make use of IP addresses which are changed periodically to make detection less likely and this is how they may go for an extended period of time without being blocked.
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Closed 5 years ago.
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I know that in LSR, each router sends LSA packet to its neighbors, which is then flooded. But I can't figure out how the routers know the complete topology in this process.
Link state update packets contains information about originating router, its interfaces and neighbors connected via these interfaces, therefore, by collecting and joining this information any router can build graph of the network (or area) to which it belongs.
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Closed 9 years ago.
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I want to Know my modem support caller-id and show number or not
I use this AT-command:
AT+FCLASS=?
I know if that response contains 8 support voice but if modem dosnt support voice it means cant support caller-id too?
I use Conexant USB CX93010 ACF Modem
I assume you by caller-id means the supplementary service called CLIP - Calling Line Identification Presentation (for GSM/UMTS networks). You can check if your modem supports this by running AT+CLIP=?. To enable +CLIP: ... unsolicited responses after RING run AT+CLIP=1. Read 27.007 for more details.