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Computer Networking
Computer networks are collections of computers which are connected together in order to communicate and transfer information. Questions about computer networks, networking protocols, and how to set them up belong here.
18,810 Questions
What is the Minimum required channel bandwidth of a 4 bit word operating at 9600 bps?
According to Nyquist Signaling Theorem:
Rmax = 2Wc pulse/second
where R is the maximum transmission rate in pulse/second
Wc is the channel bandwidth
In your case you have R in bit/s, so the theorem becomes
Rmax = 2Wc *m bit/second
where m is the number bits in each pulse, i.e. bit/pulse
So the solution to your problem is
Wc=9600/(2*4)=1200 Hz
Regards,
DHCP server and default gateway
What layer of OSI model does HTTP operate?
HTTPS is not a separate protocol, but refers to use of ordinary HTTP over an encrypted Secure Sockets Layer (SSL) or Transport Layer Security (TLS) connection. So it really does not have a place per say, because it's not a protocol it's a hybrid. Or you can say it originates in the Application layer and then finishes in the Presentation layer.
How is a cidr subnet mask implied?
With CIDR and VLSM, the subnet mask can no longer be implied. The routing protocol must include information about the subnet mask, when a router sends updates to other routers. This makes some older routing protocols unsuitable for such cases; for example, RIP version 1 is unsuitable, but RIP version 2 was changed so that it included the subnet mask.
With CIDR and VLSM, the subnet mask can no longer be implied. The routing protocol must include information about the subnet mask, when a router sends updates to other routers. This makes some older routing protocols unsuitable for such cases; for example, RIP version 1 is unsuitable, but RIP version 2 was changed so that it included the subnet mask.
With CIDR and VLSM, the subnet mask can no longer be implied. The routing protocol must include information about the subnet mask, when a router sends updates to other routers. This makes some older routing protocols unsuitable for such cases; for example, RIP version 1 is unsuitable, but RIP version 2 was changed so that it included the subnet mask.
With CIDR and VLSM, the subnet mask can no longer be implied. The routing protocol must include information about the subnet mask, when a router sends updates to other routers. This makes some older routing protocols unsuitable for such cases; for example, RIP version 1 is unsuitable, but RIP version 2 was changed so that it included the subnet mask.
Calculate the number of hosts for a specified network?
Write the subnet mask in binary. The zeroes at the end represent the host bits, and therefore, the size of the network. If (for example) you have ten zeroes at the end, you rais 210 = 1024. That's the number of addresses in the network. Of these, the first and the last are reserved for special purposes, and can't be used for host addresses, so the complete calculation (in this case) is 210 - 2.
Write the subnet mask in binary. The zeroes at the end represent the host bits, and therefore, the size of the network. If (for example) you have ten zeroes at the end, you rais 210 = 1024. That's the number of addresses in the network. Of these, the first and the last are reserved for special purposes, and can't be used for host addresses, so the complete calculation (in this case) is 210 - 2.
Write the subnet mask in binary. The zeroes at the end represent the host bits, and therefore, the size of the network. If (for example) you have ten zeroes at the end, you rais 210 = 1024. That's the number of addresses in the network. Of these, the first and the last are reserved for special purposes, and can't be used for host addresses, so the complete calculation (in this case) is 210 - 2.
Write the subnet mask in binary. The zeroes at the end represent the host bits, and therefore, the size of the network. If (for example) you have ten zeroes at the end, you rais 210 = 1024. That's the number of addresses in the network. Of these, the first and the last are reserved for special purposes, and can't be used for host addresses, so the complete calculation (in this case) is 210 - 2.
Does SSH have NOP's like the one described at Wikipedia?
The abbreviation NOP does not appear on Wikipedia's page on Secure Shell, not any of the other pages that are listed on the disambiguation page for "SSH." Nor do any of the terms that NOP could possibly refer to.
What is one thing a technician can determine about a system when using a command ipconfig?
Local system IP address,Subnet mask and Default Gateway of a computer
What are the three layers of the hierarchical network design model?
A hierarchical network design includes the following three layers:
The backbone (core) layer that provides optimal transport between sites
The distribution layer that provides policy-based connectivity
The local-access layer that provides workgroup/user access to the network
http://docwiki.cisco.com/wiki/Internetwork_Design_Guide_--_Internetworking_Design_Basics#Function_of_the_Access_Layer
Difference between context switching and schedulling?
Scheduling has to do with how the job scheduler decides which task will have the CPU and for how long. This is the technique of multi-tasking; the appearance of running multiple processes at the same time (when they really aren't).
Context switching occurs when a process needs to do something in a privileged way, such as requiring communication with another hardware device. When the process is typically running it is in user mode, which is a non-privileged mode of operation. It has to context switch into kernel (privileged) mode to do things, then switch back.
The main difference between the two is that context switches happen in a non-predictive manner in the same program/process, and job scheduling is predictable (to a point).
Then again, they serve different needs of the Operating System, as well.
It is public IP address space.
172.16.0.0 - 172.31.255.255 is private (172.16.0.0/12)
What does IP address mean in spanish?
The "IP" part is not translated, so you just say dirección IP.
What happen during segmentation in transport layer protocol?
The original data stream is broken into pieces, called "segments"; each segment is numbered (numbering is by bytes, not by segments). Other header information is added too, for example, the origin and destination port numbers.
The original data stream is broken into pieces, called "segments"; each segment is numbered (numbering is by bytes, not by segments). Other header information is added too, for example, the origin and destination port numbers.
The original data stream is broken into pieces, called "segments"; each segment is numbered (numbering is by bytes, not by segments). Other header information is added too, for example, the origin and destination port numbers.
The original data stream is broken into pieces, called "segments"; each segment is numbered (numbering is by bytes, not by segments). Other header information is added too, for example, the origin and destination port numbers.
Your internet can be not faster than your internet connection (DSL, cable modem and so on). If you have a slow internet connection, installing a new router will not fix the speed. It might improve stability of wireless signal and security though.
What is the purpose of the 7-byte preamble and 1-byte start-of-frame delimiter on an Ethernet frame?
The purpose is the preamble signals to the receiving node that data is incoming and indicates when the data flow is about to begin. The SFD (start-of-frame delimiter) identifies where the data field begans.
standalone hubs
Difference between synchronous and Asynchronous serial communication in micro controller?
Synchronous:
The synchronous format, receiver or transmitters are synchronized. A block of information is transmitted along with the synchronization information. This is clk oriented transmission format. This information is specially used for high speed transmission. Usually in this synchronous system one or two SYNC character are used for data synchronous data system. Transmission device send data continuously to receiving device. If the data is not ready this system continuously synchronous data until the data is unviable.
Asynchronous:
It is character oriented. Each character comes with the information of start and stop. In this system 1 for mark, 0 for space. When data are being transmitted a receiver stay at high at logic 1. This is specially used in low speed transmission.
Creating multiple subnets for different departments allows for many benefits, such as:
-Breaking up large broadcast domains, this reduces the chances of a broadcast storm and also will also reduce the impact when broadcast are sent out.
-Separation of services, this helps keep people from HR from accessing files in the engineering department who dont need to.
-Enhanced security, if a worm break out occurs in one subnet it will be a little harder for that worm to propagate along side making it harder for "hackers" to gain full control of network resources or do a fullsystem mapping of a corporate network.
What is a bit related to IP addresses?
A bit is a binary digit - a digit that can be either a "one" or a "zero" (or true/false, or yes/no - the idea is that there are two different states).
Each IP address contains 32 bits. That's version 4, the IP currently used. In IP version 6 (expected to be used fairly soon, due to lack of addresses in IP version 4), each IP address has 128 bits.
A bit is a binary digit - a digit that can be either a "one" or a "zero" (or true/false, or yes/no - the idea is that there are two different states).
Each IP address contains 32 bits. That's version 4, the IP currently used. In IP version 6 (expected to be used fairly soon, due to lack of addresses in IP version 4), each IP address has 128 bits.
A bit is a binary digit - a digit that can be either a "one" or a "zero" (or true/false, or yes/no - the idea is that there are two different states).
Each IP address contains 32 bits. That's version 4, the IP currently used. In IP version 6 (expected to be used fairly soon, due to lack of addresses in IP version 4), each IP address has 128 bits.
A bit is a binary digit - a digit that can be either a "one" or a "zero" (or true/false, or yes/no - the idea is that there are two different states).
Each IP address contains 32 bits. That's version 4, the IP currently used. In IP version 6 (expected to be used fairly soon, due to lack of addresses in IP version 4), each IP address has 128 bits.
What information is supplied by Cisco discovery protocol?
CDP v1 includes information for:
Device-ID (Hostname of the device or hardware serial number in ASCII)
Address (The Layer 3 address of the interface that has sent the update)
Port-ID (The port on which the CDP update has been sent)
Capabilities (Describes the functional capabilities of the device)
Version (A character string containing the software version [same as in show version])
Platform (Hardware platform)
CDPv2 offers further information options. Also note that when a device runs CDPv1 it will drop v2 frames.
For more information see provided links.
Iptables rule to block traffic from 10.14.34.207?
we can use access control list for block iptables...............and how is possible that the sender dont know that all traffic was blocked
No. The cable provider has to authorize the other modem on the network before it can be used, and they will not do that, since they want you to pay for another cable installation.
Tcp ipv6 urgent help please asap?
i was messing with my router settings because my xbox live wouldn't connect.
on my ipv6 menu there was like 6 choices.
---automatically obtain ip address
---use the following ipv6 address
-subnet prefix length
-default gateway
-obtain dns server automtaically
-use the following dns server addresses
-preferred dns server
-alternate dns server
before i messed with it, it had manual settings and it had ip's.
but i changed the choice to automatically obtain ipv6 address and the dns server.
so it got rid of those numbers that were originally there.
and i don't remember those numbers.
how do i get the original numbers back?
because im trying to hook up to xbox live and now it wont connect at all.
so i have a feeling its because i messed with the ipv6 settings.
so what do i do???????
Using wireless network can someone see from same house?
when you set up you wireless network see that every access point by default broadcasts beacon messages that contain the information about you wireless network and if not protected with passwords every one can see and connect you wireless network
if you suspect experience users around you house :)
1) disable SSID broadcast in the wireless router this will keep out sending beacons and announcing your network
2) put password WEP or WPA2 [again WEP is weaker against hackers but it will work if you these hackers are lazy ones for breaking your WEP keys :) ]
The answer is " access server " . ( source - done this question before )
