Networking A Top-Down Approach: Chapter 1
Questions with verified answers
"tier-1" commercial ISPS Ans✓✓✓ national and international coverage (Level 3,
Sprint, AT&T, NTT)
access networks Ans✓✓✓ The network that physically connects an end system to
the first router (also known as the "edge router") on a path from the end system
to any other distant end system.
active optical networks (AON) and passive optical networks (PON) Ans✓✓✓ Two
types of optical-distribution network architectures
application architectures Ans✓✓✓ client-server and peer-to-peer (P2P)
Application Layer Protocol Defines Ans✓✓✓ types of messages exchanged,
message syntax, message semantics, rules, open protocols, proprietary protocols
Application Programming Interface (API) Ans✓✓✓ Specifies how a program
running on one end system asks the Internet infrastructure to deliver data to a
specific destination program running on another end system. a set of rules that
the sending program must follow so that the Internet can deliver the data to the
destination program
Application, Presentation, Session, Transport, Network, Link, Pysical Ans✓✓✓
The seven layers of the OSI model
,Application, Transport, Network, Link, and Physical Ans✓✓✓ The five layers of
the internet protocol stack
Assign keys to peers in DHT Ans✓✓✓ assign key to the peer that has the closest
ID (immediate successor of the key)
Assigning keys to peers Ans✓✓✓ convert each key to an integer, assign integer
to each peer
put (key, value) pair in the peer that is closes to the key
Authoritative DNS servers Ans✓✓✓ organization's own DNS server, providing
authoritative hostname to IP mappings for organization's named hosts
can be maintained by organization or service provider
average throughput Ans✓✓✓ When transferring a large file from Host A to Host
B across a computer network, if the file consists of F bits and the transfer takes T
seconds for Host B to receive all F bits this rate takes F/T bits/sec
bandwidth Ans✓✓✓ the width of the band in FDM
bottleneck Ans✓✓✓ the link on end-end path that constrains end-end
throughput
bottleneck link Ans✓✓✓ A link in a network which slows the throughput down
cable Internet access Ans✓✓✓ Makes use of the cable television company's
existing cable
, television infrastructure
cable, DSL, high-speed lan, wifi, 56k dial up. Ans✓✓✓ Types of ISPs
Cache Poisoning Ans✓✓✓ A compromised DNS server may put incorrect DNS
records in the reply, which will be cached at remote server
An attacker may craft a DNS query carrying forged DNS records to a remote DNS
server
Caravan Analogy Ans✓✓✓ slide 46 chapter 1
central office Ans✓✓✓ the abbreviation CO stand for?
circuit switching and packet switching Ans✓✓✓ The two fundamental
approaches to moving data through a network of links and switches
circuit switching Ans✓✓✓ end end resources allocated to, reserved for "call"
between source and destination
dedicated resources: no sharing (circuit-like, guaranteed performance)
circuit segment idle if not used by call
commonly used in traditional telephone networks
Circuit switching: FDM versus TDM Ans✓✓✓
circuit-switching Ans✓✓✓ Method to move data trhough a network of links and
switches which reserves communication sessions between end systems
Questions with verified answers
"tier-1" commercial ISPS Ans✓✓✓ national and international coverage (Level 3,
Sprint, AT&T, NTT)
access networks Ans✓✓✓ The network that physically connects an end system to
the first router (also known as the "edge router") on a path from the end system
to any other distant end system.
active optical networks (AON) and passive optical networks (PON) Ans✓✓✓ Two
types of optical-distribution network architectures
application architectures Ans✓✓✓ client-server and peer-to-peer (P2P)
Application Layer Protocol Defines Ans✓✓✓ types of messages exchanged,
message syntax, message semantics, rules, open protocols, proprietary protocols
Application Programming Interface (API) Ans✓✓✓ Specifies how a program
running on one end system asks the Internet infrastructure to deliver data to a
specific destination program running on another end system. a set of rules that
the sending program must follow so that the Internet can deliver the data to the
destination program
Application, Presentation, Session, Transport, Network, Link, Pysical Ans✓✓✓
The seven layers of the OSI model
,Application, Transport, Network, Link, and Physical Ans✓✓✓ The five layers of
the internet protocol stack
Assign keys to peers in DHT Ans✓✓✓ assign key to the peer that has the closest
ID (immediate successor of the key)
Assigning keys to peers Ans✓✓✓ convert each key to an integer, assign integer
to each peer
put (key, value) pair in the peer that is closes to the key
Authoritative DNS servers Ans✓✓✓ organization's own DNS server, providing
authoritative hostname to IP mappings for organization's named hosts
can be maintained by organization or service provider
average throughput Ans✓✓✓ When transferring a large file from Host A to Host
B across a computer network, if the file consists of F bits and the transfer takes T
seconds for Host B to receive all F bits this rate takes F/T bits/sec
bandwidth Ans✓✓✓ the width of the band in FDM
bottleneck Ans✓✓✓ the link on end-end path that constrains end-end
throughput
bottleneck link Ans✓✓✓ A link in a network which slows the throughput down
cable Internet access Ans✓✓✓ Makes use of the cable television company's
existing cable
, television infrastructure
cable, DSL, high-speed lan, wifi, 56k dial up. Ans✓✓✓ Types of ISPs
Cache Poisoning Ans✓✓✓ A compromised DNS server may put incorrect DNS
records in the reply, which will be cached at remote server
An attacker may craft a DNS query carrying forged DNS records to a remote DNS
server
Caravan Analogy Ans✓✓✓ slide 46 chapter 1
central office Ans✓✓✓ the abbreviation CO stand for?
circuit switching and packet switching Ans✓✓✓ The two fundamental
approaches to moving data through a network of links and switches
circuit switching Ans✓✓✓ end end resources allocated to, reserved for "call"
between source and destination
dedicated resources: no sharing (circuit-like, guaranteed performance)
circuit segment idle if not used by call
commonly used in traditional telephone networks
Circuit switching: FDM versus TDM Ans✓✓✓
circuit-switching Ans✓✓✓ Method to move data trhough a network of links and
switches which reserves communication sessions between end systems
