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irina [24]
3 years ago
9

The Internet is a hierarchical structure linking different levels of service providers whose millions of devices supply all the

interconnections. The three levels outlined in the book from the top down include ____________________
Social Studies
1 answer:
solong [7]3 years ago
8 0

Answer:

National service provider (NSP)

Regional service provider (RSP)

Internet service provider (ISP)

Explanation:

National service providers (NSP)  are companies that own the internet backbone infrastructure which other second party internet service providers can link to. Examples of NSPs are Orange, Sprint,  AT&T etc.  

It typically provides fibre optic cables and core routers which the ISPs link to in order to provide internet exchange for the customers.

Regional service provider (RSP)  are basically ISPs operating within a region. Unlike ISPs, they cover only defined regions. Examples are New England's NEARNet which provides internet access for residents of New England and the San Francisco Bay area BARNet for San Francisco Bay resident.

Internet service provider (ISP) are the direct link to the customers. Many NSPs also act as ISPs by using routers that can transfer network from the backbone network exchange to the receiving equipment of the end users such as mobile phones, computers etc. Examples of ISPs are AT&T, Comcast and Verizon.

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3 0
3 years ago
Symptoms of PTSD include all of the following except ________.
Bess [88]

Answer:

d. physical complaints that cannot be explained medically, is not a symptom of PTSD.

Explanation:

Posttraumatic stress disorder (PTSD) is a type of mental disorder which is caused by  exposure to a traumatic event. The traumatic event that can induce this disorder are traffic collisions, loss of loved one, sexual assault, natural disaster terrorism etc.

Some of the symptoms of the posttraumatic stress disorder include flashbacks of the traumatic event, recurring dreams, disturbing thoughts, irritability, avoiding things related to the event, detachment from others and jumpiness.    

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4 years ago
somatic symptoms and physiologic responses in generalized anxiety disorderand panic disorderan ambulatory monitor study
Ludmilka [50]

Anxiety disorder and panic attack disorder are generalized by somatic symptoms and physiologic responses.

Patients suffering from Panic Disorder or Generalized Anxiety Disorder are more sensitive to changes taking place in the body than what happens to nonanxious individuals and also have somatic symptoms like Breathlessness, Feelings of panic, and Chest pain. Patients with Panic Disorder experience distress more frequently than those having Anxiety Disorder and aid in control but their physiological kind of responses in case of intensity are comparable.

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Learn to know more about anxiety disorder and symptoms similar to a panic attack on

brainly.com/question/9652976

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