Checkpoint Exam: Physical, Data Link, and Network Layers: Network Addressing and Basic Troubleshooting Module 1 – 3 Checkpoint Exam Answers
1. A network specialist has been hired to install a network in a company that assembles airplane engines. Because of the nature of the business, the area is highly affected by electromagnetic interference. Which type of network media should be recommended so that the data communication will not be affected by EMI?
- fiber optic
2. Which physical layer network standard would use 8B/10B encoding?
- IEEE 802.15
- IEEE 802.11n
3. What are two characteristics of STP cable? (Choose two.)
- If it is improperly grounded, the shield may act as an antenna and pick up unwanted signals.
- It provides better noise protection than UTP cabling provides.
- It is easy to install compared to UTP installation.
- It is the most common network media.
- It is primarily used as backbone cabling for corporate networks.
4. In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.)
- size of the network
- electromagnetic interference
- signal modulation technique
5. What is a primary role of the Physical layer in transmitting data on the network?
- control data access to the media
- provide physical addressing to the devices
- create the signals that represent the bits in each frame on to the media
- determine the path packets take through the network
6. How do goodput, throughput, and bandwidth relate to network data transmissions?
- Goodput is always lower than throughput, which is generally lower than bandwidth.
- Throughput is always lower than goodput, which is generally lower than bandwidth.
- Goodput is always lower than bandwidth, which is generally lower than throughput.
- Throughput is always lower than bandwidth, which is generally lower than goodput.
7. Two network interns are working for a company that is installing new networks with both copper and fiber-optic cabling. The interns are reviewing information in preparation for the work. What is a property of a fiber-optic connector?
- A Duplex Multimode LC connector is similar to an SC connector, but uses a duplex connector.
- An LC connector is a widely-adopted LAN and WAN connector that uses a push-pull mechanism to ensure positive insertion.
- A straight-tip connector locks securely with a “twist-on/twist-off” bayonet-style mechanism.
- An LC connector is a smaller version of the straight-tip connector.
8. What is CSMA/CA on a network?
- an access method that is used by wireless technology to avoid duplicate SSIDs
- an access method that is used by wired Ethernet technology to avoid collisions
- an access method that is used by wireless technology to avoid collisions
- an access method that is used by any technology that has excessive collisions
9. When troubleshooting network problems, where would a network administrator find the configuration information, such as the computer names and the IP addresses that are used?
- physical topology diagram
- DHCP server
- DNS server
- logical topology diagram
10. You are asked to document your school network. What type of topology diagram would you draw to show how devices are connected to the network?
- physical topology diagram
- logical topology diagram
11. Although CSMA/CD is still a feature of Ethernet, why is it no longer necessary?
- the development of half-duplex switch operation
- the use of Gigabit Ethernet speeds
- the use of CSMA/CA
- the virtually unlimited availability of IPv6 addresses
- the use of full-duplex capable Layer 2 switches
12. Which statement describes an extended star topology?
- End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.
- End devices are connected together by a bus and each bus connects to a central intermediate device.
- Each end system is connected to its respective neighbor via an intermediate device.
- All end and intermediate devices are connected in a chain to each other.
13. In what communication mode does an Ethernet switch operate by default?
14. A technician has been asked to develop a physical topology for a network that provides a high level of redundancy. Which physical topology requires that every node is attached to every other node on the network?
15. How do hosts ensure that their packets are directed to the correct network destination?
- They send a query packet to the default gateway asking for the best route.
- They always direct their packets to the default gateway, which will be responsible for the packet delivery.
- They have to keep their own local routing table that contains a route to the loopback interface, a local network route, and a remote default route.
- They search in their own local routing table for a route to the network destination address and pass this information to the default gateway.
16. What network address and subnet mask combination would be used to create a default static route that matches any IPv4 destination?
- 255.255.255.255 0.0.0.0
- 255.255.255.255 255.255.255.255
- 0.0.0.0 255.255.255.255
- 0.0.0.0 0.0.0.0
17. What routing table entry has a next hop address associated with a destination network?
- remote routes
- directly-connected routes
- local routes
- C and L source routes
18. Which feature on a Cisco router permits the forwarding of traffic for which there is no specific route?
- route source
- outgoing interface
- gateway of last resort
19. If the default gateway is configured incorrectly on the host, what is the impact on communications?
- The host is unable to communicate on the local network.
- There is no impact on communications.
- The host can communicate with other hosts on remote networks, but is unable to communicate with hosts on the local network.
- The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.
20. A computer has to send a packet to a destination host in the same LAN. How will the packet be sent?
- The packet will be sent directly to the destination host.
- The packet will be sent to the default gateway first, and then, depending on the response from the gateway, it may be sent to the destination host.
- The packet will be sent only to the default gateway.
- The packet will first be sent to the default gateway, and then from the default gateway it will be sent directly to the destination host.
21. Which portion of the network layer address does a router use to forward packets?
- gateway address
- host portion
- network portion
- broadcast address
22. Why are two strands of fiber used for a single fiber optic connection?
- They prevent crosstalk from causing interference on the connection.
- The two strands allow the data to travel for longer distances without degrading.
- They allow for full-duplex connectivity.
- They increase the speed at which the data can travel.
23. What is a common characteristic of both CSMA/CD and CSMA/CA?
- collision-free environment
- used for both LAN and WAN
24. In which hybrid logical topology are some devices fully interconnected with all other devices, while some are not?
- hub and spoke
- partial mesh
25. Which statement describes the logical topology for a LAN?
- It defines how computers connect to a LAN.
- It depicts the locations of main routers and switches in a LAN.
- It lists the number of computers, routers, and switches on the LAN.
- It describes how computers access the LAN medium.