Chapter 1
Which technique ( packet or circuit switching) is used for internet traffic
Packet Switching
This is the lowest level of DNS Hierarchy
What are Authoritative DNS Servers
*Note
The DNS Hierarchy does not include local DNS servers
This return message is used by the receiver to let the sender know the message was not sent successfully.
What is NAK or a repeat ACK
True or False: The same address can be used multiple times in one subnet as long as it's used for different devices.
False
In routing among Autonomous Systems, which issues dominates the behavior of the system?
Policy
Frequency Division Multiplexing (FDM) is the counterpart to another type of multiplexing that relies on time slots
Time Division Multiplexing
Daily Double:
Slotted ALOHA uses the formula: Np(1-p)(N-1) while Pure ALOHA uses what formula?
Which field will tell you the total number of bytes in a TCP header
TCP header length field
This data protocol uses 128 bits as opposed to IPv4’s 32 bits.
What is IPv6
Using Dijkstra's Algorithm, if router X has 2 path options, one with the costs 3 and 2 and the other with the cost 6, which path will X choose?
X will choose the path with the costs 2 and 3 since 2 + 3 is still less than 6
Which layer of the internet handles delivery of data segments to the application layer
Transport Layer
Which protocol TCP, UDP or Neither, provides real- time delivery
Neither
Find the two’s complement of: 01010011
Flip each bit and add 1: 10101101
Which network control plane technique ( per-router or SDN approach) is responsible for all routers in the network sending information about their incoming and outgoing links to a centralized controller?
SDN approach
The purpose of this protocol is to gather data about network conditions and executing remote actions at remote managed devices
What is SNMP
If you have a maximum throughput of 1.0 mbs and your link capacity is 10.0 mbps what is your link utilization
1 / 10 = 10%
Which socket command makes a TCP socket and which makes a UDP socket?
socket(AF_INET, SOCK_STREAM)
socket(AF_INET, SOCK_DGAM)
TCP is SOCK_STREAM and UDP is SOCK_DGRAM
When will TCP apply fast retransmission
When it receives 3 duplicate ACKs for an earlier segment
Suppose an application generates chunks of 60 bytes of data every second, and each chunk gets encapsulated in a TCP segment and then an IP datagram. What percentage of each datagram will contain application data?
Daily Double:
How many bits is a MAC address?
MAC addresses are 48 bits long
Order all layers of the internet from highest level to lowest level
Application, Transport, Network, Link, Physical
How does Enter Deep in a network streaming video system allow for users to more reliably access streaming content
Enter Deep is an approach that stores multiple access networks close to as many clients as possible
This formula is used to approximate average transmission rate if a TCP connection experiences a loss when the window size of the connection hits W and RTT is constant.
0.75 W * MSS / RTT
Wireshark: Which ICMP fields always change from one message to another?
Identification and TTL
Which of the following is NOT associated with OSPF:
A) OSPF uses a Dijkstra-like algorithm to implement least cost path routing.
B) OSPF implements hierarchical routing
C) OSPF is an interdomain routing protocol
C