Cisco Systems, Inc. (known as Cisco) is an American multinational technology conglomerate headquartered in San Jose, California, in the center of Silicon Valley, that develops, manufactures and sells networking hardware, telecommunications equipment and other high-technology services and products. Through its numerous acquired subsidiaries, such as OpenDNS, WebEx, Jabber and Jasper, Cisco specializes into specific tech markets, such as Internet of Things (IoT), domain security and energy management. 

Cisco is the largest networking company in the world. The stock was added to the Dow Jones Industrial Average on June 8, 2009, and is also included in the S&P 500 Index, the Russell 1000 Index, NASDAQ-100 Index and the Russell 1000 Growth Stock Index. 

Cisco Systems was founded in December 1984 by Leonard Bosack and Sandy Lerner, two Stanford University computer scientists, who pioneered the concept of a local area network (LAN) being used to connect geographically disparate computers over a multiprotocol router system. By the time the company went public in 1990, when it was listed on the NASDAQ, Cisco had a market capitalization of $224 million. Cisco was the most valuable company in the world by 2000, with a more than $500 billion market capitalization. 

Cisco Systems was founded in December 1984 by Leonard Bosack, who was in charge of the Stanford University computer science department's computers, and his wife Sandy Lerner, who managed the Graduate School of Business' computers.

Answer this series of questions:

1. What does LAN stand for?
2. When was Cisco Systems founded?
3. By who?
4. Who was Sandy Lerner?
5. Was she related to Bosack?
6. How?
7. What is Cisco Systems, Inc.?
8. Where is its home base located?
9. What does it develop, sell and make?
10. When was its stock added to the Dow Jones?
11. How many indexes is it included in?
12. What college did Bosack and Lerner go to?
13. What concept did they come up with?
14. When did Cisco go public?
15. Can you name one of its acquired subsidiaries?
16. What is another?
17. What is the largest networking company worldwide?
18. How much was it worth as of 2000?
19. How many kids do Leonard and Sandy have?

Numbered answers:
1. local area network
2. December 1984
3. Leonard Bosack and Sandy Lerner
4. Stanford University computer scientist
5. Yes
6. his wife
7. an American multinational technology conglomerate
8. San Jose, California
9. networking hardware, telecommunications equipment and other high-technology services and products
10. June 8, 2009
11. Four
12. Stanford University
13. a local area network being used to connect geographically disparate computers over a multiprotocol router system
14. 1990
15. OpenDNS
16. WebEx
17. Cisco
18. more than $500 billion
19. unknown