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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 3 days ago.
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I am trying to detect ARP Poisoning Attack (ARP: Address Resolution Protocol).
I tried this command in CMD:
> arp -a
I would like to know what exactly this command displays and if in the output of this command if I find that two different IP addresses have same MAC address does it mean that ARP Poisoning is happening.
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Whats the difference bewteen a GSLB and ADC. I can see that both can do load balancing, but i want to know the difference and additional functionalities each can perform. And i'd also want to know if one can replace the other.
GSLB is a general Term: Global Server Load Balancing
ADC is a Citrix product which does GSLB as well as proxying traffic.
To replace an ADC deployment, which saves f**king money(man they charge lots for it),
the proxy part can be replaced with NGINX + Server, the GSLB(which is just DNS with healthchecks) can be replaced with BIND(which actually runs on ADC as a service) and healthckeck to the backend server to remove/add record to DNS.
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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 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 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.