CTI-120 Modules 30,31,32
In what communication mode does an Ethernet switch operate by default?
full-duplex
Which feature on a Cisco router permits the forwarding of traffic for which there is no specific route?
gateway of last resort
An enterprise has four branches. The headquarters needs full connectivity to all branches. The branches do not need to be connected directly to each other. Which WAN topology is most suitable?
hub and spoke
Which topology type describes the process that hosts use to access and communicate on a network?
logical
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?
logical topology diagram
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?
logical topology diagram
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?
mesh
Which portion of the network layer address does a router use to forward packets?
network portion
What is a common characteristic of both CSMA/CD and CSMA/CA?
nondeterministic
What routing table entry has a next hop address associated with a destination network?
remote routes
What is a characteristic of CSMA/CA that differs from CSMA/CD?
An end device sends a notification across the media before it sends a data frame.
On a point-to-point network, which communication type is used when two devices can both transmit and receive but not at the same time?
Half-duplex
Which media access method requires that an end device send a notification across the media before sending data?
CSMA/CA
What information does the loopback test provide?
The TCP/IP stack on the device is working correctly.
A computer can access devices on the same network but cannot access devices on other networks. What is the probable cause of this problem?
The computer has an invalid default gateway address.
How do goodput, throughput, and bandwidth relate to network data transmissions?
Goodput is always lower than throughput, which is generally lower than bandwidth
What is used on WLANs to avoid packet collisions?
CSMA/CA
What is CSMA/CA on a network?
an access method that is used by wireless technology to avoid collisions
A router receives a packet from the Gigabit 0/0 interface and determines that the packet needs to be forwarded out the Gigabit 0/1 interface. What will the router do next?
create a new Layer 2 Ethernet frame to be sent to the destination
What is a primary role of the Physical layer in transmitting data on the network?
create the signals that represent the bits in each frame on to the media
When a router receives a packet, what information must be examined in order for the packet to be forwarded to a remote destination?
destination IP address
What type of route is indicated by the code C in an IPv4 routing table on a Cisco router?
directly connected route
In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.)
electromagnetic interference crosstalk
In which hybrid logical topology are some devices fully interconnected with all other devices, while some are not?
partial mesh
Which two statements describe features of an IPv4 routing table on a router? (Choose two.)
-If a default static route is configured in the router, an entry will be included in the routing table with source code S. -The routing table stores information about routes derived from the active router interfaces.
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.
What network address and subnet mask combination would be used to create a default static route that matches any IPv4 destination?
0.0.0.0 0.0.0.0
If the default gateway is configured incorrectly on the host, what is the impact on communications?
1000Base-T In Manchester encoding, the transition occurs at the middle of each bit period. Manchester encoding is used in older Ethernet standards such as 10BASE-T. Ethernet 100BASE-X family uses 4B/5B encoding and 1000BASE-X uses 8B/10B encoding.
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 straight-tip connector locks securely with a "twist-on/twist-off" bayonet-style mechanism.
Which statement describes an extended star topology?
End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.
A router is receiving a stream of incoming packets that does not contain a route to the remote destination network. What configuration can a network administrator issue in order to successfully forward the incoming packets?
Add a default route
A dental office provides a WLAN in the waiting area for patients to access the Internet. The WLAN is equipped with a wireless router that connects to the Internet through a cable connection. Which data transmission mode is used by wireless devices?
Half-duplex
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
Which two commands can be used on a Windows host to display the routing table? (Choose two.)
route print netstat-r
A school is adding 10 computers to a classroom. What is the most common physical network topology that is used in a classroom?
star
Which LAN topology requires a central intermediate device to connect end devices?
star
What type of route is created when a network administrator manually configures a route that has an active exit interface?
static
During the process of forwarding traffic, what will the router do immediately after matching the destination IP address to a network on a directly connected routing table entry?
switch the packet to the directly connected interface
Which address should be configured as the default gateway address of a client device?
the IPv4 address of the router interface that is connected to the same LAN
Although CSMA/CD is still a feature of Ethernet, why is it no longer necessary?
the use of full-duplex capable Layer 2 switches
Why are two strands of fiber used for a single fiber optic connection?
They allow for full-duplex connectivity
If a company has decided not to use static routing for the four routers inside the company, what would be an alternative solution?
Install a routing protocol
How does a device use CSMA/CA technology to avoid collisions?
It sends a notification before transmitting when the media is free.
What is the first step in the CSMA/CA process when a wireless client is attempting to communicate on the wireless network?
The client listens for traffic on the channel
Which statement correctly describes the operation of CSMA/CD?
The end device waits until there are no data signals then transmits the data while listening for collisions.
If the default gateway is configured incorrectly on the host, what is the impact on communications?
The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.
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
How do hosts ensure that their packets are directed to the correct network destination?
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.
