Distributed Systems and Networks

Question 1

ACID

Answer 1

Atomicity
Consistency
Isolation
Durability

Question 2

Atomicity

ACID

Answer 2

A transaction must be all or nothing

Question 3

Consistency

ACID

Answer 3

A transaction takes the system from one consistent state to another

Question 4

Isolation

ACID

Answer 4

Each transaction must be performed wihtout interference from other transactions

Question 5

Durability

ACID

Answer 5

After a transaction has completed successfully, all its effects are saved in permanent storage

Question 6

IPv6 address conventions

2001:0630:00d0:f500:0000:0000:0000:0064

Answer 6

• can omit leading 0s in a block
• can replace sets of repeating 0s with “::”
• e.g. 2001:630:d0:f500::64

Question 7

IPv4 subnet address availability

Answer 7

• First is reserved for the network address
• Last is the broadcast address
• One is required for the router
• => 524/253 usable address

Question 8

IPv4 subnet CIDR/mask values

Answer 8

• /24 : 256 addresses
• As the number increases (/25…), half the number of addresses (128)
• As the number decreases (/23…), double the number of addresses (512)

Question 9

IPv6 subnet split

Answer 9

Always /64

Question 10

TCP/IP stack

Answer 10

• Physical
• Link
• Network
• Transport
• Application

Question 11

DHCP

Answer 11

How systems get a dynamic IP address