Notes, abstracts, papers, exams and problems of Technology

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Classified in Technology

Written at on English with a size of 16.01 KB.

1. Refer to the exhibit. The network administrator needs to setup Switch1 for remote access from HostA. Theshow ip interface brief is issued on Router1 and the show interfaces trunk command is issued on theSwitch1 to verify the current status. The administrator applies the additional configuration shown in theexhibit to Switch1. However, the telnet from HostA fails. What additional commands need to be appliedto the switch?
Switch(config)# interface vlan 10
Switch(config-if)# ip address
Switch(config-if)# no shutdown
Switch(config-if)# ip default-gateway

2. Refer to the exhibit. On the basis of the configuration shown, how will an Ethernet frame on port GigabitEthernet0/1 be modified?
802.1Q encapsulation inserts

... Continue reading "Ccna3" »

Domestic Electrical Installations

Classified in Technology

Written at on English with a size of 14.02 KB.

The electricity used to meet our energy needs (housing, buildings and industries) But there are serious dangers such as fires and electrocucions if facilities do not meet the appropriate security.
Low Voltage Electrotechnical Regulations (REBT) technical conditions and guarantees must be met by electrical installations connected to a low voltage supply in order to:
-Preserve the safety of persons and property.
-Ensure the normal operation of these facilities and prevent disruptions that could cause other facilities and prevent disruptions that could cause other facilities and services.
-Contribute to the technical reliability and efficiency of economic facilities.
Complementary technical instructions (ITC - BT)... Continue reading "Domestic Electrical Installations" »

Centos 5.5

Classified in Technology

Written at on English with a size of 5.39 KB.

#useradd nombredeusuario :: para crear usuarios

#passwd :: nombredelusuario

#groupadd :: nombredelgrupo :: (forma normal)

#groupadd -g 600 nombredelgrupo :: (guid sobre 650)

#userdel nombredelusuario :: para deletear usuarios

#groupdelnombredelgrupo :: borrar el grupo

#usermod -G nombredelgrupo nombredeusuario :: para asignar usuario a grupo.

opcion 2: editar archivo /etc/group -> grupo:x:600:usuarioqueseagregara

#nano /etc/shadow :: para poder ver los usuarios y poder bloquearlos

#passwd -l nombredeusuario :: para bloquear usuario

#passwd -u nombredeusuario :: para desbloquear usuario

#sudo passwd :: para cambiar la contraseña de root

# tail /etc/passwd :: paraver informacion de usuarios

#su nombredelotrousuario :: para iniciar sesion como el usuario... Continue reading "Centos 5.5" »

I is correct ii is correct

Classified in Technology

Written at on English with a size of 1.35 KB.

tecnology= is an applied science used 4 solve problems in real life. Create or design goods or services. 2 allows us the adaptation of the enviroment 4 our needs and to pleases our desires

algorithm=Is a set of instructions for resolve problems or performate an action

project aproach: Is Create something to solve a problem. 10 steps: 1. Problem (see and analyze the problem / 2. Research= find information fo problem / 3. Possible solution = we propose all posible solutions / 4. Choose 1 possible solution / 5. Design= we think , design to build the solution / 6. Planning = we do a sceetch of the building / 7. Build= we build the final solution / 8. Check = we check if its correct * if it isn´t correct, we go to find another solution / 9. Presentation... Continue reading "I is correct ii is correct" »


Classified in Technology

Written at on English with a size of 7.92 KB.

What is DATA: Data is raw facts and figures. These have very little meaning until they are sorted or they are used to make calculations. The process of sorting or calculating data is called data processing. The result of data processing is information

What is information: Is when Data is processed, organized, structured or presented in a given context so as to make it useful. 3 stages of doing tasks with data 1. Data is put into the information systems (INPUT) 2. The data is processed (PROCESS) 3. Information comes out of the information system (OUTPUT)

Big data 7v's : Value: Data usefulness in decision making. Volume: Data scale. Velocity: Data processing. Variability: Data flow inconsistency. Variety: Data heterogeneity, structure, semi-structured,

... Continue reading "Content" »

Sikandria port

Classified in Technology

Written at on English with a size of 1.19 KB.

Border Gateway Protocol : EGP protocol which runs between different AS no.

IBGP -- Forming neighborship between routes of same AS

EBGP -- Forming neighborship between routers of different AS

AD -- IBGP 200 EBGP 20

Runs on TCP port no 179 

Path attributes : Wellknown ; optional
Wellknown - Mandatory | Discretinary
Optional -   Transitive | Non-transitive

Wellknown Mandatory : As-path, origin, Nexthop
Welllknown Discretinary : local-preference , Atomic aggregate

Optional Transitive : Community , Aggregator
Optional Non transitive : MED , Cluster , Weight

Path Selection :  We love oranges as oranges meant for pure refreshment.
Local preference
Router ID 

Types of Moulds and Their Characteristics for Casting

Classified in Technology

Written at on English with a size of 5.13 KB.

Moulds for Casting

Mould made of ceramic material e.g. sand particles, bound together with a BINDER which may be:

  • Clay: 90% sand, 8% clay, 2% water - green sand mould.
  • Thermosetting resin system - coat sand with two or more reactants which cure to form a resin (typically 1 - 2 parts binder to 100 parts sand):
    • Curing begins immediately components are combined, for a period of time after initial mixing the sand is workable and flowable to allow filling of mould - No bake systems.
    • Phenolic - urethane no bake is most common.
    • Curing occurs upon application of heat – heat cured binder system.
    • Liquid thermosetting binder and a catalyst are mixed with dry sand. Upon heating the catalyst releases acid which induces a rapid cure in 10 – 15 s. Pattern is
... Continue reading "Types of Moulds and Their Characteristics for Casting" »

Stone Materials: Types, Properties, and Uses

Posted by silviagc__ and classified in Technology

Written at on English with a size of 8.33 KB.

STONE MATERIALS: Stone materials are often used for construction because they are strong, durable and very resistant to weather conditions.

1.1. Extracting and processing stone: Stone is extracted from natural deposits. Some types exist as large blocks, such as marble and granite from quarries, which must be cut into smaller pieces. Other materials, such as gravel and sand, are aggregates.

1.2. Natural stone: -Limestone is a porous sedimentary rock. It is often used for sculptures and buildings, as well as for breakwaters in ports. -Limestone is used to produce lime and cement.

-Marble is a hard rock. Marble is cool to the touch and well-known for its resistance to compression and extreme weather conditions. Marble comes in a variety of colors... Continue reading "Stone Materials: Types, Properties, and Uses" »

Air law

Classified in Technology

Written at on English with a size of 1.75 KB.

Tough:we can manufacture Windows, bottles or Lenses for impact resistant glasses.Littles Resistant to strain:we cannot build structures (bridges, buildings…) with plastic, not object (ladders, bicycles…) that must resisit great strains.Phoodegradable: continued exposure to Sunligth degrades them and makes them more brittle over time.


Compression:applies mainly to termostable plastics.Plastic Is placed in a Steel mold and it is heated to make it pasty.Pressure is applied With a hydraulic press so that the plastic takes the shape of the mold(lamp Holders).Vacunn forming: a plastic Sheet is placed on the mold of the object we want to manufacture.Using electric Resistances the sheet is heated untilit softens. The mold and the hot sheet

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Computer Types: From Supercomputers to Personal PCs

Classified in Technology

Written at on English with a size of 1.24 KB.


Supercomputers are the fastest type of computer available, used for complex calculations in specialized fields like weather forecasting. Their high cost limits their use to specific applications.


Mainframes were originally large cabinets housing central processing units. With the advent of smaller computers, the term evolved to describe powerful machines capable of handling large-scale operations and supporting numerous users simultaneously.


Minicomputers are mid-sized systems that bridge the gap between mainframes and workstations. They can support multiple users and offer processing power suitable for various tasks.

Personal Computer (PC)

Personal computers are small, affordable computers designed for individual... Continue reading "Computer Types: From Supercomputers to Personal PCs" »