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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
Concept of unicast ip address?
A unicast message is a message directed to a specific device on a network (just one specific device). It would have a destination IP address that corresponds to that device.
the author of the information is anonymoue
I can access web but can't access lan resources on network?
Many times this is because the resources are part of a Windows Domain. Domains have strict security capabilities that will lock computers not part of the domain out. You can have your machine physically on the same network, but not part of the domain, and if that is the case, you will not be able to use domain resources. Ask your tech support goons to either add your machine to the domain, ensure that your current user login is a domain user, and make sure that your password has not expired.
Is an IP address alone enough evidence of illegal activity in court?
No, it's not. IP address give a right to get permission from a judge to check your computer for illegal, stolen and so on stuff. The last ones are evidence enough in court.
What are three limitations of Fast Ethernet?
A. Distance is restricted to 100 meters from node
to hub.
B. Shielding may be inadequate for some
installations.
C. Intrusion from outsiders may be possible
without detection.
Your IP is 71.183.254.119 what is your gateway address?
Since this appears to be in the Verizon IP range it would be safe to assume they are your internet provider. You would need to contact them to ask what the default gateway address would be. If you are not using a static IP address the gateway IP should be provided by DHCP along with the other IP configuration information.
You can only connect to your wireless router when the microwave is on or your phone is?
Try changing thechannel that the router is operating on
it works when they or on it CONNECTS when they are on
DEModulating
What is the spanning-tree network diameter on a cisco switch?
The default value for network diameter on a STP configuration is 7 (seven).
This value can be changed, using the command:
Switch(config)#spanning-tree vlan 1 root primary diameter 5
This command changes the network diameter 50 5 (five) hops from end to end
What is the lo device displayed in the ifconfig command?
it's the loopback address. The IP address listed under it can be pinged to test to see if your NIC is working
What does a bit that is set to 0 in an ip subnet mask specify?
the corresponding bit in the ip address is a host bit
Can a wirless access point access internet wirelessly?
Most commonly in houses there is a wired connection from the ISP to the wireless access point. The computers in the house are wirelessly connected to the wireless access point.
Having said that, access points that make use of 3G cellphone networks or WiMax do connect wirelessly to the internet. But that is not common yet.
It allows you to use 1 desktop on multiple pcs which updates as u add applications on one of them.
A whole netwrk of pcs.
VERY CONVINIENT
Does Enabling MAC filtering weaken security?
Enabling MAC address filtering improves security as only computers known to the network are allowed to join and any computers trying to join when their MAC address is not recognised are blocked.
What equipment do you need for a computer network that has 250 computers and 30 ft ceilings?
1. A router and modem that can take that many computers
2. A lot of switches (although I have heard of business models that serve about 50 computers at a time)
Apparently since lost packets are always there once this error code is on your computer, it holds bearing in your PING command. Avoid using the PING command if you can not identify whether it is physical trouble or a virus is causing files to go corrupt thus the error code 0xc000000f!
Only a Mesh will allow every node to continue to work on a network if one cable does down. In a Star topology, however, only the computer the cable was connected to would lose contact with the network.
What are the different Views in operating system?
Application View: what services does it provide?
System View: what problems does it solve?
Implementation View: how is it built?
Application View of an Operating System
? The OS provides an execution environment for running programs.
- The execution environment provides a program with the processor time
and memory space that it needs to run.
- The execution environment provides interfaces through which a program
can use networks, storage, I/O devices, and other system hardware
components.
Interfaces provide a simplified, abstract view of hardware to application
programs.
- The execution environment isolates running programs from one another
and prevents undesirable interactions among them.
CS350 Operating Systems Fall 2005
Intro 1
What is an Operating System?
? Three views of an operating system
Application View: what services does it provide?
System View: what problems does it solve?
Implementation View: how is it built?
An operating system is part cop, part facilitator.
CS350 Operating Systems Fall 2005
Intro 2
Application View of an Operating System
? The OS provides an execution environment for running programs.
- The execution environment provides a program with the processor time
and memory space that it needs to run.
- The execution environment provides interfaces through which a program
can use networks, storage, I/O devices, and other system hardware
components.
Interfaces provide a simplified, abstract view of hardware to application
programs.
- The execution environment isolates running programs from one another
and prevents undesirable interactions among them.
CS350 Operating Systems Fall 2005
3
Other Views of an Operating System
System View: The OS manages the hardware resources of a computer system.
? Resources include processors, memory, disks and other storage devices,
network interfaces, I/O devices such as keyboards, mice and monitors, and
so on.
? The operating system allocates resources among running programs. It
controls the sharing of resources among programs.
? The OS itself also uses resources, which it must share with application
programs.
Implementation View: The OS is a concurrent, real-time program.
? Concurrency arises naturally in an OS when it supports concurrent
applications, and because it must interact directly with the hardware.
? Hardware interactions also impose timing constraints.
4
Schematic View of an Operating System
User Programs
Resources
results
and data
system calls system call
Operating System
commands data and interrupts
system call interface
Intro 1
What is an Operating System?
? Three views of an operating system
Application View: what services does it provide?
System View: what problems does it solve?
Implementation View: how is it built?
An operating system is part cop, part facilitator.
CS350 Operating Systems Fall 2005
Intro 2
Application View of an Operating System
? The OS provides an execution environment for running programs.
- The execution environment provides a program with the processor time
and memory space that it needs to run.
- The execution environment provides interfaces through which a program
can use networks, storage, I/O devices, and other system hardware
components.
Interfaces provide a simplified, abstract view of hardware to application
programs.
- The execution environment isolates running programs from one another
and prevents undesirable interactions among them.
CS350 Operating Systems Fall 2005
3
Other Views of an Operating System
System View: The OS manages the hardware resources of a computer system.
? Resources include processors, memory, disks and other storage devices,
network interfaces, I/O devices such as keyboards, mice and monitors, and
so on.
? The operating system allocates resources among running programs. It
controls the sharing of resources among programs.
? The OS itself also uses resources, which it must share with application
programs.
Implementation View: The OS is a concurrent, real-time program.
? Concurrency arises naturally in an OS when it supports concurrent
applications, and because it must interact directly with the hardware.
? Hardware interactions also impose timing constraints.
4
Schematic View of an Operating System
User Programs
Resources
results
and data
system calls system call
Operating System
commands data and interrupts
system call interface
5
Operating System Abstractions
? The execution environment provided by the OS includes a variety of abstract
entities that can be manipulated by a running program. Examples:
files and file systems: abstract view of secondary storage
address spaces: abstract view of primary memory
processes, threads: abstract view of program execution
sockets, pipes: abstract view of network or other message channels
? This course will cover
- why these abstractions are designed the way they are
- how these abstractions are manipulated by application programs
- how these abstractions are implemented by the OS
6
Course Outline
? Introduction
? Processes and Threads
? Concurrency and Synchronization
? Address Spaces and Virtual Memory
? Scheduling
? Devices and Device Management
? File Systems
? Interprocess Communication and Networking
? Security
Intro 1
What is an Operating System?
? Three views of an operating system
Application View: what services does it provide?
System View: what problems does it solve?
Implementation View: how is it built?
An operating system is part cop, part facilitator.
CS350 Operating Systems Fall 2005
Intro 2
Application View of an Operating System
? The OS provides an execution environment for running programs.
- The execution environment provides a program with the processor time
and memory space that it needs to run.
- The execution environment provides interfaces through which a program
can use networks, storage, I/O devices, and other system hardware
components.
Interfaces provide a simplified, abstract view of hardware to application
programs.
- The execution environment isolates running programs from one another
and prevents undesirable interactions among them.
CS350 Operating Systems Fall 2005
3
Other Views of an Operating System
System View: The OS manages the hardware resources of a computer system.
? Resources include processors, memory, disks and other storage devices,
network interfaces, I/O devices such as keyboards, mice and monitors, and
so on.
? The operating system allocates resources among running programs. It
controls the sharing of resources among programs.
? The OS itself also uses resources, which it must share with application
programs.
Implementation View: The OS is a concurrent, real-time program.
? Concurrency arises naturally in an OS when it supports concurrent
applications, and because it must interact directly with the hardware.
? Hardware interactions also impose timing constraints.
4
Schematic View of an Operating System
User Programs
Resources
results
and data
system calls system call
Operating System
commands data and interrupts
system call interface
5
Operating System Abstractions
? The execution environment provided by the OS includes a variety of abstract
entities that can be manipulated by a running program. Examples:
files and file systems: abstract view of secondary storage
address spaces: abstract view of primary memory
processes, threads: abstract view of program execution
sockets, pipes: abstract view of network or other message channels
? This course will cover
- why these abstractions are designed the way they are
- how these abstractions are manipulated by application programs
- how these abstractions are implemented by the OS
6
Course Outline
? Introduction
? Processes and Threads
? Concurrency and Synchronization
? Address Spaces and Virtual Memory
? Scheduling
? Devices and Device Management
? File Systems
? Interprocess Communication and Networking
? Security
What is the advantages for studying at utp?
In UTP, u are exposed to students from more then 20 different countries where u can develop your communication skills n learn others culture. UTP is the place u can get the best engineering certificate in Malaysia other than its best technology and laboratory facilities. Plus, UTP is the only university that offers double internship and practical compared to others. Futhermore, the objective of UTP to nurture well rounded graduates boost up their side activities like cocuricular activities and more.There are many other benefits and i advice anyone who want to get know more about UTP should visit this website, www.utp.edu.my or contact the current studying students.
A d-link router is a standard network router, one which was made under the brand-name d-link. In all important respects it is equal to a similarly equipped linksys or netgear router, but is a less expensive brand.
A DNS Server can be primary for one zone and secondary for another True or False?
False. The DNS records cannot be added directly to the secondary DNS zone. The secondary DNS zone can receive the updated records only from the primary DNS zone of the DNS server.
Subnet: A portion of a network that shares a common address component. On TCP/IP networks, subnets are defined as all devices whose IP addresses have the same prefix. For example, all devices with IP addresses that start with 100.100.100. would be part of the same subnet. Dividing a network into subnets is useful for both security and performance reasons. IP networks are divided using a subnet mask.
Gateway: A gateway is a network point that acts as an entrance to another network. On the Internet, a node or stopping point can be either a gateway node or a host (end-point) node. Both the computers of Internet users and the computers that serve pages to users are host nodes. The computers that control traffic within your company's network or at your local Internet service provider (ISP) are gateway nodes. Can transcode or allow different protocols to talk to each other.
How do you transport a space shuttle on the ground?
Before launch the shuttle is moved to the launchpad by the Shuttle Crawler-Transporter from the Vehicle Assembly Building. If the last landing has occurred at the Edwards Airforce Base in California, it will have been brought to this building by the Shuttle Carrier Aircraft, a 747 especially adapted to 'piggyback' it. At other times, the shuttle is pushed or towed by vehicles similar to those that move planes at airports.
See the related links below.
The orbiter vehicle, commonly known as the space shuttle, is actually only one piece of the Shuttle Transportation System (STS), which is stacked with the External Tank (ET) and the Solid Rocket Boosters (SRB's) only after it has been prepared for flight in the Orbiter Processing Facility (OPF). Once prepared for flight in the OPF, the landing gear remains in the "up" position until the orbiter lands, following each mission.
The flight-ready orbiter is transported aboard a special multi-wheeled transporter from the OPF to the Vehicle Assembly Building (VAB) where large cranes hoist it off the transporter and lift it into place aboard the Crawler-Transporter where it will be mated to the already stacked ET and SRB's to form the STS.
Once the orbiter returns to the Kennedy Space Center landing facility, either having been transported here by the Shuttle Carrier Aircraft (SCA) or directly landing following a mission, it will be towed to the OPF using an aircraft-tow "tug", where it will be prepared for its next mission, beginning the cycle all over again.
