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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 purpose of the Frame Check Sequence field in a Data Link frame trailer?
The purpose of the FCS field is to transmit the extra checksum characters added to a frame in "xyz" protocol for error detection. The most popular algorithm I've used is the CRC (cyclic redundancy check) employed in things like ethernet or PPP on a routed network.
Keep in mind that ethernet defines that the errored frame should be discarded, but ethernet takes no action to cause the frame to be retransmitted. Typically most tech's see it as unnecessary overhead and opt to rely on CSMA\CD or CSMA\CA if the route is not deemed to carry time sensitive data.
Hope that clears things up a bit.
Preboot Execution Environment
What do you call a fiber optic cable in which the light signals follow a single path?
Baseband systems use digital signaling over a single channel. Signals flow in the form of discrete pulses of electricity or light. Figure 2.19 shows a baseband transmission with a bidirectional digital wave. With baseband transmission, the entire communication channel capacity is used to transmit a single data signal. The digital signal uses the complete bandwidth of the cable, which constitutes a single channel. The termbandwidthrefers to the data transfer capacity, or speed of transmission, of a digital communications system as measured in bits per second (bps).
What TCPIP utility was the most useful in your opinion for troubleshooting these problem Why?
TCP IP utility was the most useful when troubleshooting for a few reasons. It contains important information like NetBIOS over TCP IP and there connections.
What does this mean -Ethernet adapter local area connection 3- media State Media disconnected?
The meaning of the error "Ethernet adapter local area connection 3- media state media disconnected" is that the cable is bad or not plugged in all the way to the media device. It is best to check the cable and make sure that it is plugged in.
What devices on one network to communicate with devices on another network?
usally Firewalls config for comunicate to another network
Firewall located in edge of network,firewall is a roter or a pc with a special software.
Which statement correctly characterizes cable types and their usage?
Fiber optic cable is primarily used for networking within a single building.
Is Wireshark a security threats?
Alone, Wireshark is not a significant threat. provided that no hubs are used on a network and switches are not attacked (see Macoff) then a user running wireshark will only see traffic from their own host (see micro-segmentation).
Wireshark and other packet sniffing programs should only be used by administration staff on networks as traditional users have no legitimate use for them.
What is IP datagram fragmentation and MTU?
IP datagram can be used to describe a portion of IP data. Each IP datagram has set of fields arranged in an order. The order is specific which helps to decode and read the stream easily. IP datagram has fields like Version, header length, Type of service, Total length, checksum, flag, protocol, Time to live, Identification, source and destination ip address, padding, options and payload.
MTU:- Maximum Transmission Unit is the size of the largest packet that a communication protocol can pass. The size can be fixed by some standard or decided at the time of connection
Fragmentation is a process of breaking the IP packets into smaller pieces. Fragmentation is needed when the datagram is larger than the MTU. Each fragment becomes a datagram in itself and transmitted independently from source. When received by destination they are reassembled.
Why there is no need for the ICMPv4 message to travel outside its own network?
There is no need for the ICMPv4 message to travel outside of its own network because its only purpose is to inform the next router in the spanning tree of group member-ship.
How many ip addresses will ipv6 provide?
IP is the internet protocol that uniquely identifies a system on a network and there are 2^128 addresses in IPv6 (IP version 6).
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frame check sequence field
When would you use a router on an Ethernet network?
to split the Internet between different computers or to make it wireless if it is a wireless router
How many ip addresses are there in a class A?
There are 2^24 host in class A but (2^24)-2 hosts are valid since the first and last address are reserved .
What conditions must be met in order for a network to have converged?
The routers in the network are operating with consistent routing knowledge.
What factors do network consultants consider when determining the network needs of a business?
How much the business is willing to pay them.
What are design issues of transport layer?
A transport layer is the backbone of TCP/IP and the Internet. In this day and age, there are not design flaws in the system. The design of transport layer incorporates data stream with transmission.
