CISCO CERTIFIED NETWORK ASSOCIATE CCNA EXAM

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CISCO CERTIFIED NETWORK ASSOCIATE (CCNA) EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -100 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: What do TCP and UDP ports allow multiple network applications to do?A ? Resolve the MAC address of the computer host they run on B ? Connect to network interface card (NIC) drivers C ? Connect their sending and receiving counterparts on the same sending and receiving computer hosts D ? Resolve the IP address of the computer host they run on

Answer:

• Connect their sending and receiving counterparts on the same sending and receiving computer

hosts. TCP and UDP ports allow multiple network applications to connect their sending and receiving counterparts on the same sending and receiving computer hosts.

Question 2: Wired Equivalent Privacy (WEP)

Answer:

The first wireless security protocol that was introduced to secure the over-the-air communication between Wireless Access Point (WAP) Devices and Wireless Network Interface Card (NIC) Devices. It's very easy to configure but not very secure.

Question 3: What is the main advantage of wireless LANs?

A ? Elimination of wired connections B ? Elimination of crosstalk C ? Elimination of signal attenuation D ? All of the above

Answer:

• The main advantage of wireless connections is the elimination of wired connections.

Question 4: "Noise" Generated by Broadcast Queries

Answer:

One computer sends a broadcast query to every other device in the network to obtain an IP address or a MAC address, and eventually the target computer responds. Meanwhile, all computers in the broadcast domain have "heard" the broadcast request. They were disturbed by a request that does not concern them. If lots of broadcast requests are being sent on the network by hosts that just joined the network, for example, a broadcast storm can occur: Everyone is disturbed by everyone's broadcast request, and the network performance is considerably impacted.

Question 5: In connection-oriented transport, which of the following occurs?

A ? Sending and receiving hosts exchange TCP acknowledgments.B ? Sending and receiving hosts sequence their TCP segments.C ? Sending and receiving hosts perform a three-way handshake.D ? All of the above.

Answer:

• All of the above. In connection-oriented transport, sending and receiving hosts exchange TCP

acknowledgments, sequence their TCP segments, and perform a three-way handshake to establish a connection before they start their communication.

Question 6: WLAN security issues can be mitigated using which of the following?

A ? Wi-Fi Protected Access (WPA) B ? MAC address filtering C ? Wired Equivalent Privacy (WEP) D ? All of the above

Answer:

• All of the above. Several methods are available to mitigate the inherent security risks of wireless

networks, including WPA, MAC address filtering, and WEP.

Question 7: Cisco Hierarchical Network Model - Distribution Layer

Answer:

The Distribution Layer links the Core Layer to the Access Layer. The distribution layer is also called the Workgroup Layer. The distribution layer is involved in routing packets between nodes connected at the access layer. Packets may need to be routed to a different network, which may be located within the same distribution layer network, or through the core layer in a different distribution layer network.Routers typically interconnect at the distribution layer. The main functions performed by switches and

routers at the distribution layer are as follows:

? Finding the best network route for packets ? Filtering packets ? Interconnecting LANs ? Connecting LANs to WANs ? Relaying packets to the core layer as needed ? Securing networks ? Distribution and Core Layers: Routers, on the other hand, specialize in efficient and optimal routing of data packets between networks. Hence, they typically operate at the distribution and core layer, which are optimized for bulk and backbone traffic handling. No end-device connections are done at the distribution and core layers.

Question 8: Network Applications - Voice over IP (VoIP) and Video over IP

Answer:

This network application allows the transfer of voice and video signals over the Internet Protocol. Many Web sites stream video over the Internet today. These sites use some VoIP network application to wrap their video content in IP packets and send them over the network to the computer host that requested the streamed video content. Another example of VoIP is Cisco IP phones, which are being adopted today by many organizations to save costs by concentrating their phone and data traffic over the same IP infrastructure.Question 9: Wireless local-area networks (WLANs) are standardized by which of the following standards?A ? IEEE 802.3w B ? IEEE 802.11w

C ? IEEE 802.11

D ? All of the above

Answer:

• The IEEE 802.11 standard defines the characteristics and specifications of wireless networks.

Question 10: Which of the following describes a Web browser?

A ? Layer 7 (application) protocol B ? Layer 7 software application C ? Layer 6 (presentation) software application D ? All of the above

Answer:

• Layer 7 software application. A Web browser is a Layer 7 software application.

Question 11: Network Applications - Shared Network Storage

Answer:

This network application connects advanced specialized storage devices to a storage network, making them accessible to any computer host connected to that storage network. Storage networks can be either ? Isolated, that is, connecting only to a few computer hosts locally ? Connected to other data networks

Question 12: Message Collision

Answer:

After two computers know about each other and they start to communicate, they send data frames on the link that is shared by all other computers in that network segment. If two computers try to send frames at the same time, on the same wire, the frames collide. In that case, both computers back off: They stop sending frames, they wait a little while, and they try to resend. You have no guarantee that the frames will not collide again when they are resent. Typically, there are few chances that they collide again, because the two computers wait random time periods that are likely different. However, collisions do happen, and they can slow a network considerably. The more hosts you add to a network segment, the more chances of having frame collisions. It's best to keep network segments as small as possible.Question 13: Cisco Internetwork Operating System (IOS), Cisco Network Assistant (CNA), Cisco Security Device Manager (SDM), and Cisco Device Manager (DM). Explain Cisco SDM...

Answer:

It is a computer application used to monitor and manage Cisco routers from a central management console. It is available for Windows. It provides a graphical user interface (GUI) that allows the network administrator to have both global and detailed views of the Cisco routing environment.Question 14: Cisco Internetwork Operating System (IOS), Cisco Network Assistant (CNA), Cisco

Security Device Manager (SDM), Cisco Device Manager (DM): Explain Cisco IOS...

Answer:

Is Cisco's proprietary switch and router operating system. Is stored in flash memory on the Cisco device.