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Local Area Network
Questions concerning the setting up, troubleshooting and operation of wired LANs used by businesses and other organizations
4,003 Questions
What information in a frame does a switch or bridge use to populate the MAC address table?
Source MAC address and source port
What network use star topology?
Star topology:- In this topology all PC are connected with the central device. Central may be HUB and SWITCH. Star widely use in all over word. Ring topology:- In this ring topology all PC are connected in the frame of ring are close Ring topology use MSAU each PC has a two never road one is called up Stream and called down stream. It used token passing Matterhorn which implement the token ring network. " Is the best of star topology".
Which device directs signals to all other nodes on a LAN?
A hub or repeater will repeat signals to all other devices on a LAN. In addition, any broadcast packet will be repeated to all other nodes of a LAN as well.
What is the difference between IGP and EGP?
IGP stands for Interior Gateway Protocol...and EGP- Exterior gateway protocol
As name suggests..that IGP works for Intra-Autonoumus system...and EGP works between two Autonoumous system
IGP examples: RIP,OSPF,EIGRP
EGP: IS-IS,BGP...
Explain the Distance Vector Routing Protocols and its features?
Distance Vector means that Routers are advertised as vector of distance and direction. 'Direction' is represented by next hop address and exit interface, whereas 'Distance' uses metrics such as hop count.
Routers using distance vector protocol do not have knowledge of the entire path to a destination. Instead DV uses two methods:
- Direction in which or interface to which a packet should be forwarded.
- Distance from its destination.
Assuming you are running in synchronous mode, a counter with a propagation time of 25 ns can run up to 40 MHz. Since there are other gates involved, I would consider a margin of safety to be 20 MHz.
Mesh
What are the routing metrics for OSPF?
OSPF uses cost as its routing metric .
cost is calculated for every outgoing interface of a router through which packets transfer.
it is calculated by the formula
cost = 100000000/(bandwidth of output interface)
most likely bandwidth of serial int is 1544kb= 1544000 bytes
PS: all cost calculation to be done in bytes for ease
the time between the arrival of material at a workstation and the start of work on it
What are two reasons you would use DHCP on your network?
The Dynamic Host Configuration Protocol (DHCP) is a network management protocol commonly used for (among other things) assigning dynamic IP addresses to network clients. The primary benefit of using this technology is you can take a finite amount of IP address space and partition it out to transient users as it is needed, reclaiming addresses no longer in use. The use of DHCP also saves end users and desktop administrators from manually assigning IP addresses to systems. Let's look at how DHCP works.
When configuring DHCP, the network administrator sets a value known as the DHCP lease. This is the amount of time a system may retain an IP address without contacting the DHCP server. When the time expires, the system must reach out to the server and request a renewal of the DHCP lease. Generally speaking, DHCP leases are set to a long period of time (measured in days) on stable networks where the same systems are generally present from day-to-day. On the other hand, networks with many transient users (such as public hotspots) typically have short lease times to allow the efficient reuse of addresses.
DHCP churn is a term used to describe the fact that different systems may obtain the same IP address from a DHCP server when the first system's lease expires. This really isn't a problem, except in two special cases:
- You're trying to track systems for some purpose and don't have access to the DHCP logs. For example, if you're maintaining a spam blacklist and a spamming system shows up on your blacklist with a DHCP-provided address, you may inadvertently block future users of that address from sending mail.
- You're a researcher measuring the prevalence of some phenomenon across the Internet and use IP addresses to track systems. If a single system exhibits your target behavior, but has many different dynamically assigned addresses, it might skew your results.
The bottom line is, unless you're in one of those two very special cases, DHCP churn isn't a big deal. You should set your DHCP lease lifetime based upon your expected users needs and not worry about this issue.
*This answer was taken from the related link.
Is peer to peer networking can be use by straight row?
Yes, peer to peer can be implemented in linear bus topology.
The question does not make sense; ICMP isn't broken - it is the protocol for informing other devices or users that there are problems on the network, or for control messages in general.
How many collision domains exist in a network with 15 hosts interconnected by means of a hub?
For any amount of clients connected to a hub you will get a total of 1 collision domain. A hub is a device that simply repeats all of the signals from the ports and does not separate clients into separate collision domains.
Depends on what is modifying the controls is using the computers system is operationg.
Is OSPF link state or distance vector or path vector protocol?
OSPF is a link-state routing protocol.
UDP typically should not be used where quality (not speed) is desired.
What are the types of protocols?
routing protocol:
helps to find the best path to transfer the packets from one network to diffrent network
example:
rip: routing information protocol
igrp, ospf......
routed protocol:
helps to carry the packets to the destination.
example:
smtp : transfer the mails
ftp : transfer the files.
What is an optical fiber and how can messages be sent through it?
optical fiber is made from extremely pure glass that is stretched out to a very thin and flexible wire. fiber optic wire is often used in locations of computer networks with a very high load because of the speed of light. it simply uses the same hexidecimal and binary codes to transmit data over the network just like regular Ethernet cables, except much much much faster.
No, ICMP is not a routing protocol. ICMP (Internet Control Message Protocol) is used by the Internet Protocol suite (IP) to send error and status messages. It is mainly used for diagnostics. Ping and traceroute are two tools that use ICMP. ICPM is used by routing protocols, for routing advertisements and router discovery.
Which command can be used on a PC to determine which TCP IP ports are in use?
Open command prompt and type netstat
This will show all ports in use and all ingoing\outgoing connections along with the connection type. TCP, UDP
