C172 Lesson 5 (Quizzes, Exercises, Labs)
A Layer 2 switch operates at
layer 2 of the OSI model and uses the MAC or Ethernet address for making decisions related to forwarding data packets.
Routing tables on a router keep track of:
routes to use for forwarding data to its destination.
gateway
used to describe the address of the networking device that enables the hosts in a LAN to connect to networks and hosts outside the LAN.
network segment
defines the networking link between two LANs and there is a segment associated with each connection of an internetworking device.
A broadcast can cause a
network slow-down
Which of the following is a layer 3 device that uses the network address to make the routing decisions to forward the data packets?
router
A Layer 2 switch improves
the efficiency of the data transfer in the network.
A temporary storage of MAC addresses recently contacted is called which of the following?
- ARP cache - ARP table
What does a managed switch allow a network administrator to do?
- Manage certain network features. - Configure network features. - Monitor network features.
The connection to the router's console input is typically which of the following?
- RJ-45 - RS-232
Which of the following are advantages of using a bridge to interconnect LANs?
- Relatively inexpensive - Reduces collision domains - Easy to install
A network administrator wants to verify the network connection at 10.10.20.5. Which of the following commands can be used to verify the connection?
- ping -t 10.10.20.5 - ping 10.10.20.5
The AUI port is used to connect which of the following?
10Mbps Ethernet
What information is stored in a bridge table?
A bridge table stores the MAC address and port locations for hosts connected to the bridge ports.
Which of the following best defines bridge table?
A list of MAC addresses and port locations for hosts connected to the bridge ports
What does an empty ARP cache indicate?
All the ARP entries have expired.
Why do entries into the bridge table have a limited lifetime?
Each MAC address entry in the bridge table remains active as long as there is periodic data traffic activity. The entries expire so that the table only lists the MAC addresses for the networking devices that have recently been active in the network.
The AUI port on a router connects to which networking protocol?
Ethernet
What router interface is most commonly used to interconnect LANs in a campus network?
Ethernet
The designation E0 indicates:
Ethernet port 0
Which switch mode offers the minimum switch latency?
Fast-forward
What do a router's routing tables do?
Keep track of the routes to forward data to its destination
A network switch operates at which layer of the OSI model?
Layer 2: Data link layer
Dynamic assignment on a switch implies which of the following?
MAC addresses are assigned to a port when a host is connected.
Which of the following does a router use in order to make routing decisions regarding forwarding of data packets?
Network address
How does a switch provide a link with minimal collisions?
Only the two computers or networking devices that established the link communicate on the channel.
Which of the following command is used by network administrator to verify the network connection to the particular IP address?
Ping
By convention, what is the name of serial port 0 on a router?
S0
Which two modes does a switch use to forward frames?
Store-and-forward and cut-through
Which switch mode offers minimum latency?
The fast-forward mode offers the minimum switch latency. The receiv
Which of the following best defines aging time?
The length of time a MAC address remains assigned to a port
What happens if a MAC address is not stored in CAM on a switch?
The packet is transmitted out all switch ports except for the port where the packet was received. This is called flooding
What is the purpose of the Secure Address tab on a switch?
The switch port will automatically disable itself if a device with a different MAC address connects to the port.
Serial interfaces on a router are typically used for which of the following?
To connect to communication carriers
A router uses the network address on a data packet for what purpose?
To make routing decisions about which router interface to forward the data
Which of the following device interconnects two LANs running the same type of networking protocol?
Transparent bridge
A Layer 2 switch provides
a direct data connection for network devices in a LAN.
A Layer 2 switch minimizes
data collisions and maximizes the use of a LAN's bandwidth.
What is an error threshold, and which switch mode is it associated with?
Cut-through mode is used until an error-threshold (errors in the data packets) has been exceeded. The switch mode changes from cut-through to store-and-forward when the error threshold has been exceeded.
What does AUI stand for?
Attachment unit interface
Which of the network devices uses the MAC address information to make decisions regarding the forwarding of data packets, and is used to interconnect two LANs that are operating two different networking protocols?
Bridge
The link for a switch connection is isolated from other data traffic except for what type of messages?
Broadcast and multicast
Which of the following is a table of MAC addresses and port mapping used by a switch to identify connected network devices?
CAM
In which switch mode is a data packet forwarded to the destination as soon as the destination MAC address has been read?
Cut-through
