CCNA Practice Exam 2024 | CCNA Practice
Actual Exam Update 2024 Questions and
Correct Answers Rated A+
QUESTION NO: 1
What functions do routers perform in a network? (Choose two.)
A. path selection
B. packet switching
C. VLAN membership assignment
D. micro segmentation of broadcast domains -ANSWER-Answer: A, B
Explanation:
The primary functions of a router are: Packet Switching and Path Selection.
It is the routers job to determine the best method for delivering the data,
and switching that data as quickly as possible. (1) Intercept datagrams sent
to remote network segments between networks, playing a translated role.
(2) Select the most reasonable route to guide communications. In order to
achieve this function, the router will check the routing table based on
certain routing communication protocol, and the routing table lists all the
nodes contained in the entire internet , the path conditions between nodes
and transmission costs associated with them. If a specific node has more
than one path, then select the optimal path based on pre-determined
specifications. Because a variety of network segments and their mutual
connection situations may change, the routing information needs to be
updated in time, which is completed by timing update or updating according
to changes determined by the routing information protocol used. Each
router in the network dynamically updates its routing table according to this
rule to maintain effective routing information. (3)When forwarding
datagrams, in order to facilitate transferring datagrams between networks,
routers will divide large data packets into appropriate sized data packets
according to predetermined
specifications, and those appropriate sized data packets will be turned into
their original form when reaching the destination. (4)Multi-protocol routers
can connect and use network segments of different communication
,protocols , they can be used as communication connecting platforms of
network segments of different communication protocols.
(5)The main task of router is to guide the communications to the destination
network, and then reach the addresses of the specific node st
QUESTION NO: 2
Which of the following is true regarding the use of switches and hubs for
network connectivity?
A. Using hubs can increase the amount of bandwidth available to hosts.
B. Hubs can filter frames.
C. Switches increase the number of collision domains in the network.
D. Switches do not forward broadcasts.
E. Switches take less time to process frames than hubs take. -ANSWER-
Answer: C
Explanation:
A hub is a broadcast domain and a collision domain, while a switch is a
broadcast domain, each
interface is a collision domain. The switch is a device of data link layer,
forwards and floods data
frames based on the MAC address. The hub adopts the shared bandwidth
working mode, while
the switch adopts dedicated bandwidth.
Switches increases the number of collisions domains in the network.
Switches that are configured
with VLANs will reduce the size of the collision domains by increasing the
number of collision
domains in a network, but making them smaller than that of one big, flat
network.
Incorrect Answers:
A: Switches and hubs can be equally efficient in processing frames, in
theory. In practice, switches
are generally more efficient as they usually have more CPU and memory
allocated to them, and
are generally much more expensive than a simple hub.
B: Switches are capable of VLAN configurations, but hubs are not.
,E: Switches forward broadcasts and multicasts, by default, to all ports
within the same VLAN. Only
routers block all broadcast traffic by default.
QUESTION NO: 3
When comparing and contrasting the similarities and differences between
bridges and switches,
which of the following are valid statements? (Choose two)
A. Bridges and switches learn MAC addresses by examining the source
MAC address of each
frame received.
B. A switch is a multiport bridge
C. Bridges and switches increase the size of a collision domain.
D. Bridges are faster than switches because they have fewer ports. -
ANSWER-Answer: A,B
Explanation:
Bridge is a Layer2 device, which is designed to create two or more LAN
segments. Each segment
is an independent collision domain. Bridge is also created to provide more
available bandwidth, Its
purpose is to filter the LAN traffic, making local traffic be in the local area,
and those directed to
other parts of the LAN (sub) be forwarded there. Each NIC on each device
has a unique MAC
address. Bridge will record the MAC address of each port and then make
forwarding decisions
based on this MAC address table.
Switch is a device of the data link layer, it combines multiple physical LAN
segments into a large
network.. Similar to bridge, the switch will transfer and flood the
communication frames based on
the MAC address. Because the switching process is performed in
hardware, the switching speed
of the switch is faster than that of a bridge performed by software.
Regarding each switching port as a mini-bridge, then each switching port
, will work as an independent bridge to provide full medium??s bandwidth to
each host. The number of ports of bridges and switches are the same as
that of collision domains. All ports are in the same broadcast domain. Both
bridges and switches build the bridge table by listening to incoming frames
and examining the source MAC address in the frame. Switches are
multiport bridges that allow you to create multiple broadcast domains. Each
broadcast domain is like a distinct virtual bridge within a switch. Incorrect
Answers:
D: Switches are generally faster than bridges. Bridges also do not
necessarily have fewer ports
than switches.
QUESTION NO: 4
As a network administrator, you will need to decide on the appropriate
network devices to use.
Which of the following correctly describes the roles of devices in a WAN?
(Choose three)
A. A modem terminates a digital local loop.
B. A CSU/DSU terminates a digital local loop.
C. A CSU/DSU terminates an analog local loop.
D. A modem terminates an analog local loop.
E. A router is commonly considered a DTE device. -ANSWER-Answer:
B,D,E
Explanation:
Layer 2 switching is considered hardware-based bridging because it uses
specialized hardware
called an application-specific integrated circuit (ASIC). ASICs can run up to
gigabit speeds with
very low latency rates. A router is commonly considered to be a DTE
device, while a CSU/DSU is considered the DCE
device.
Switches usually have higher port number then bridge. Generally bridges
have two ports. Both
operates on Data link layer.
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