Term
| Which is an appropriate definition of protocol |
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Definition
| A set of rules that enable communication between peer entities (same layers on different devices) |
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Term
| What are the three main steps of connection oriented communications (e.g. circuit switching) |
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Definition
| Establishment of communication, transfer of information, termination of communication |
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Term
| What do we mean when we say the Internet is a best-effort packet delivery technology? |
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Definition
| It means that for any packet the Internet will not give any guarantees of delivery |
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Term
| Which of the following is referred to as layer 1 (one) of the protocol stack? |
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Definition
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Term
| In the IETF protocol layer stack: |
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Definition
| A layer offers services just to the adjacent layer above it |
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Term
| Which layer is in charge of keeping state information about a communications session? |
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Definition
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Term
| What is the data unit of the network layer? |
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Definition
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Term
| A socket is sometimes refer to as a duple of an {IP address, a port number}. Any packet with transport layer payload is thus going to have an outgoing and an incoming socket. Suppose that at home your PC has been assigned the IP address 192.188.57.200. You start Firefox and connect to www.ohio.edu (132.235.8.149). Firefox sends a HTTP GET message to www.ohio.edu asking for the main web page; to this request transport (TCP) and network (IP) headers are added. With Wireshark you inspect the OUTGOING packet to find out the SOURCE socket used. Which one of the following would you expect to find as the source socket. (Hint the port number is represented by a 16 bit field). |
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Definition
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Term
| How many bits are there in R Megabytes? |
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Definition
| (R X 1024 X 1024 X 8 ) bits |
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Term
| A file of R Megabytes is transmitted over a line in a period of 1 hour. What is the average data rate of the transfer in bps? |
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Definition
| (R X 1024 X 1024 X 8 / 3600) bps |
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Term
| How many seconds does it take to transfer a L byte packet over a communication line that has a transmission rate of S bps? |
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Definition
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Term
| A typical frame on a 100 Mbps Ethernet network has a length 1514 bytes. What is the total delay in seconds to transfer this packet to a destination 100 meters away at a propagation speed of C meters per second? |
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Definition
| (1514 X 8 / 100 Mbps) + (100 /C) |
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Term
| IP subnetting: For the network 192.188.57.0/24 you are asked to create 8 subnetworks. How many additional bits do you need to use for the network part? |
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Definition
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Term
| IP subnetting - For the network 9.0.0.0/8 you are asked to create 32 subnetworks. How many bits do you need to use for the network part? |
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Definition
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Term
| IP subnetting - What is the broadcast address of the 132.235.0.0/17 network? |
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Definition
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Term
| IP subnetting - What is the broadcast address of the 12.0.0.0/15? |
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Definition
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Term
| IP subnetting - What is the broadcast address of the 192.188.57.64/27 network? |
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Definition
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Term
| IP subnetting - What is the broadcast address of the 9.128.0.0/11 network? |
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Definition
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Term
| IP subnetting - What is the dotted decimal notation of the network mask for the network 192.188.57.64/28? |
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Definition
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Term
| IP subnetting - What is the dotted decimal notation of the network mask for the network 9.128.0.0/10? |
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Definition
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Term
| You send a ping message with a TTL =3, to a host located 5 hops away. What message would you expect to receive back? |
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Definition
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Term
| How many IP addresses does IPv6 have? |
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Definition
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Term
| Which of the following is an implementation drawback of slotted ALOHA? |
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Definition
| Nodes have to be synchronized to the slots in the system |
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Term
| In a deep space network link (e.g. from a station on Earth to a rover on Mars) would you use CSMA/CD as a mechanism to share the communications link? |
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Definition
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Term
| In a switched Ethernet environment are collision between frames possible or not? |
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Definition
| No, collisions never occur |
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