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Chapter 2: Network Topology
1. The network cloud may comprise only the network found in a small laboratory, or it may represent an
entire wide area network (WAN) such as the Internet.
ANS: T PTS: 1 REF: 22
2. With certain types of network communications, it is possible that duplicate packets of data are
generated if an acknowledgement is not received by the source computer.
ANS: T PTS: 1 REF: 23
3. In a fully connected network, the number of connections at each node equals the total number of nodes
ANS: F PTS: 1 REF: 25
4. Even if the encrypted traffic is intercepted, chances are very small that the contents can be decrypted if
a suitably strong encryption method and key are used.
ANS: T PTS: 1 REF: 31
5. A network that can be partitioned is secure and reliable.
ANS: F PTS: 1 REF: 31
1. The connections for the ____ of a network may be provided through dedicated phone lines, twisted
pair cable, fiber optic cable line-of-sight microwave RF, ATM, or other form of electronic connection.
a. physical topology c. physical infrastructure
b. virtual topology d. virtual interconnection
ANS: A PTS: 1 REF: 22
2. When a large amount of data must be sent between machines on a network, it is possible to set up a
____ between the machines.
a. permanent circuit c. virtual interface
b. virtual circuit d. physical interface
ANS: B PTS: 1 REF: 23
3. A ____ uses public network connections to establish private communication by encrypting the data
transmitted between the two computers at each end of the connection.
a. NPV c. PVN
b. VN d. VPN
ANS: D PTS: 1 REF: 23-24
4. Seven fully connected nodes require ____ links.
a. 14 c. 28
b. 21 d. 35
ANS: B PTS: 1 REF: 25
5. A ____ network uses a single shared common communication media that all nodes tap into.
a. ring c. bus
b. star d. string
ANS: C PTS: 1 REF: 26
6. In a bus network, if two or more nodes transmit data at the same time, a ____ occurs.
a. collision c. collusion
b. compression d. contention
ANS: A PTS: 1 REF: 26
7. Token-ring networks, although logically viewed as rings, are connected using central ____.
a. media access units c. station access units
b. multistation access units d. access units
ANS: B PTS: 1 REF: 27
8. A(n) ____ is a 32-bit number used to locate and identify nodes on the Internet.
a. MAC address c. Ethernet address
b. TCP address d. IP address
ANS: D PTS: 1 REF: 29
9. A ____ is a portion of a network.
a. subnet c. slice
b. subunit d. subdivision
ANS: A PTS: 1 REF: 29
10. Companies that connect to a NAP enter into ____ agreements with each other that allow them to
a. posting c. peering
b. partner d. polling
ANS: C PTS: 1 REF: 30
1. A(n) ____________________ circuit is a prearranged path through the network that all packets will
travel for a particular session between machines.
PTS: 1 REF: 23
2. In a star network, all nodes connect to a central communications ____________________.
PTS: 1 REF: 25
3. ____________________ is a logical, not physical, activity and is accomplished using a special subnet
mask, such as 255.255.255.192.
PTS: 1 REF: 29
4. A(n) ____________________ network is owned and managed by a private organization or company
and may have a much larger bandwidth capability than a public network.
PTS: 1 REF: 30
5. In terms of security and reliability, we must concern ourselves with what is required to
____________________ our network.
PTS: 1 REF: 31
Match each item with the correct statement below.
a. Tunnels d. NAPs
b. Topology e. Cloud
c. Logical topology
1. Concerns the structure of the connections between the computers in a network
2. A graphical symbol used to describe a network without specifying the nature of the connections
3. Has to do with the path a packet of data takes through the network
4. Logical connections between the nodes of the VPN
5. Provide access to national and global network traffic
1. ANS: B PTS: 1 REF: 22
2. ANS: E PTS: 1 REF: 22
3. ANS: C PTS: 1 REF: 22
4. ANS: A PTS: 1 REF: 24
5. ANS: D PTS: 1 REF: 29
1. Describe a mesh network.
In general, a mesh network is a collection of computers that are not connected in a bus, star, or ring
topology. The term full mesh, or fully connected mesh, is only used when each node is connected to
each other node. A partially connected network does not have as many links as a full mesh, making it
PTS: 1 REF: 25
2. Discuss the difference between a hub and a switch.
One characteristic of a hub is that it broadcasts data received on one port to all other ports, essentially
sending copies of data from one node to all other nodes on the LAN. In this way, each node on the
network has an opportunity to see each packet of network data. A similar device called a switch learns
where to send the data, eliminating a large majority of the broadcast traffic on the LAN. The switch
also provides the Star topology.
PTS: 1 REF: 26
3. Describe a hybrid network.
A hybrid network combines the components of two or more network topologies. Two star networks
are connected (with three additional nodes) via a bus. This used to be a common way to implement
Ethernet, with coax running between classrooms or laboratories and hubs in each room to form small
subnetworks. Putting together a hybrid network takes careful planning, for there are various rules that
dictate how the individual components may be connected and used. For example, when connecting
Ethernet segments, a maximum of four repeaters may be used with five segments. Furthermore, if a
4-Mbps token-ring network is interfaced with a 10-Mbps Ethernet network, there are performance
issues that must also be taken into consideration (because any Ethernet traffic is slowed down to
4Mbps on the token-ring side). In addition, the overall organization of the hybrid network, from a
logical viewpoint, must be planned out as well.
PTS: 1 REF: 27
4. Discuss subnetting.
Subnetting is a logical, not physical, activity and is accomplished using a special subnet mask, such as
255.255.255.192, that is logically ANDed with an IP address to determine its network address. The
subnet mask is used to separate the IP address into two components: the network portion of the address
and the host portion of the address. Here the host represents a node on the network. Nodes on different
logical subnets cannot talk to each other without the use of a router, so using subnets allows the
network designer to manage network traffic in a straightforward manner.
PTS: 1 REF: 29
5. Describe a private network.
A private network is owned and managed by a private organization or company and may have a much
larger bandwidth capability than a public network, depending on how much money its parent company
invests in network infrastructure (by installing its own media between sites or by leasing private,
dedicated communication lines from the telephone company). Private networks have higher
maintenance costs per user and have the capability of restricting access to sensitive data.
PTS: 1 REF: 30-31