Cisco 200-105 Study Guides 2021

NEW QUESTION 1
Which type does a port become when it receives the best BPDU on a bridge?

• A. the backup port
• B. the root port
• C. the designated port
• D. the alternate port

Answer: D

NEW QUESTION 2
Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface?

• A. Router(config-if)# ppp authentication chap fallback ppp
• B. Router(config-if)# ppp authentication chap pap
• C. Router(config-if)# authentication ppp chap fallback ppp
• D. Router(config-if)# authentication ppp chap pap

Answer: B

Explanation: The command “ppp authentication chap pap” command indicates the CHAP authentication is used first. If it fails or is rejected by other side then uses PAP instead. If you want to use PAP first (then CHAP) you can use the “ppp authentication pap chap” command Reference: http://www.cisco.com/en/US/docs/ios/12_2/security/configuration/guide/scfathen.html

NEW QUESTION 3
Which WAN topology provides a direct connection from each site to all other sites on the network?

• A. single-homed
• B. full mesh
• C. point-to-point
• D. hub-and-spoke

Answer: B

NEW QUESTION 4
Refer to the exhibit.

While troubleshooting a switch, you executed the show interface port-channel 1 etherchannel command and it returned this output. Which information is provided by the Load value?

• A. the percentage of use of the link
• B. the preference of the link
• C. the session count of the link
• D. the number source-destination pairs on the link

Answer: D

NEW QUESTION 5
Which IEEE standard does PVST+ use to tunnel information?

• A. 802.1x
• B. 802 1q
• C. 802.1w
• D. 802.1s

Answer: B

NEW QUESTION 6
Refer to the exhibit.

The Lakeside Company has the internetwork in the exhibit. The administrator would like to reduce the size of the routing table on the Central router. Which partial routing table entry in the Central router represents a route summary that represents the LANs in Phoenix but no additional subnets?

• A. 10.0.0.0/22 is subnetted, 1 subnetsD 10.0.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
• B. 10.0.0.0/28 is subnetted, 1 subnetsD 10.2.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
• C. 10.0.0.0/30 is subnetted, 1 subnetsD 10.2.2.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
• D. 10.0.0.0/22 is subnetted, 1 subnetsD 10.4.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
• E. 10.0.0.0/28 is subnetted, 1 subnetsD 10.4.4.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
• F. 10.0.0.0/30 is subnetted, 1 subnetsD 10.4.4.4 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1

Answer: D

Explanation: All the above networks can be summarized to 10.0.0.0 network but the question requires to “represent the LANs in Phoenix but no additional subnets” so we must summarized to
10.4.0.0 network. The Phoenix router has 4 subnets so we need to “move left” 2 bits of “/24-> /22 is the best choice - D is correct.

NEW QUESTION 7
What OSPF command, when configured, will include all interfaces into area 0?

• A. network 0.0.0.0 255.255.255.255 area 0
• B. network 0.0.0.0 0.0.0.0 area 0
• C. network 255.255.255.255 0.0.0.0 area 0
• D. network all-interfaces area 0

Answer: A

Explanation: Example 3-1 displays OSPF with a process ID of 1 and places all interfaces configured with an IP address in area 0. The network command network 0.0.0.0 255.255.255.255 area 0
dictates that you do not care (255.255.255.255) what the IP address is, but if an IP address is enabled on any interface, place it in area 0.
Example 3-1 Configuring OSPF in a Single Area
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
Reference: http://www.ciscopress.com/articles/article.asp?p=26919&seqNum=3

Topic 4, WAN Technologies

NEW QUESTION 8
After you configure a new router to connect to a host through the GigabitEthernet0/0 port of the router, you log in to the router and observe that the new link is down Which action corrects the Problem?

• A. Use a crossover cable between the host and R1.
• B. Use a straight through cable between the host and R1.
• C. Configure the host to use R1 as the default gateway.
• D. Use a rollover cable between the host and R1.

Answer: A

NEW QUESTION 9
Which command do you enter to enable an interface to support PPPoE on a client?

• A. Dev1(config)# bba-group pppoe bba 1.
• B. Dev1(config-if)# pppoe-client dial-pool-number 1.
• C. Dev1(config-if)# pppoe enable group bba1.
• D. Dev1(config-if)# pppoe enable.

Answer: B

NEW QUESTION 10
Which VLAN bridge priority value will make a switch as root for a given VLAN from the below options by the spanning-tree vlan vlan-id root command?

• A. 16384
• B. 8192
• C. 28672
• D. 32768

Answer: B

NEW QUESTION 11
Refer to Exhibit:

The internetwork infrastructure of company XYZ consists of a single OSPF area as shown in the graphic. There is concern that a lack of router resources is impeding internetwork performance. As part of examining the router resources, the OSPF DRs need to be known. All the router OSPF priorities are at the default and the router IDs are shown with each router. Which routers are likely to have been elected as DR? (Choose two.)

• A. Corp-1
• B. Corp-2
• C. Corp-3
• D. Corp-4
• E. Branch-1
• F. Branch-2

Answer: DF

Explanation: There are 2 segments on the topology above which are separated by Corp-3 router. Each segment will have a DR so we have 2 DRs.
To select which router will become DR they will compare their router-IDs. The router with highest (best) router-ID will become DR. The router-ID is chosen in the order below:
The highest IP address assigned to a loopback (logical) interface.
If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.
In this question, the IP addresses of loopback interfaces are not mentioned so we will consider IP addresses of all active router’s physical interfaces. Router Corp-4 (10.1.40.40)
& Branch-2 (10.2.20.20) have highest “active” IP addresses so they will become DRs.

NEW QUESTION 12
Refer to the exhibit.

Which three EIGRP routes will be present in the router R4's routing table? (Choose three.)

• A. 172.16.1.0/24
• B. 10.1.10.0/30
• C. 10.0.0.0/8
• D. 10.1.11.0/30
• E. 172.16.0.0/16
• F. 192.168.1.0/24

Answer: CEF

Explanation: EIGRP performs an auto-summarization each time it crosses a border between two different major networks, so when R2 advertises the routes to R4 it will advertise only the summarized routes of 10.0.0.0/8 and 172.16.0.0/16, along with the 192.168.1.0/24 route coming from R3.

NEW QUESTION 13
Which PPP subprotocol negotiates authentication options?

• A. NCP
• B. ISDN
• C. SLIP
• D. LCP
• E. DLCI

Answer: D

Explanation: A protocol that establishes, configures, and tests data link connections used by the PPP Link Control Protocol offers PPP encapsulation different options, including the following: Authentication - options includes PAP and CHAP Compression - Data compression increases the throughput on a network link, by reducing the amount of data that must be transmitted. Error Detection -Quality and Magic numbers are used by PPP to ensure a reliable, loop-free data link.
Multilink - Supported in IOS 11.1 and later, multilink is supported on PPP links between Cisco routers. This splits the load for PPP over two or more parallel circuits and is called a bundle.

NEW QUESTION 14
The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command?

• A. This command should be executed from the global configuration mode.
• B. The IP address 10.121.16.8 is the local router port used to forward data.
• C. 102 is the remote DLCI that will receive the information.
• D. This command is required for all Frame Relay configurations.
• E. The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC.

Answer: E

Explanation: The command frame-relay map ip 10.121.16.8 102 broadcast means to map the remote IP 10.121.16.8 to the local DLCI 102. When the “broadcast” keyword is included, it turns Frame Relay network as a broadcast network, which can forward broadcasts.

NEW QUESTION 15
What are three values that must be the same within a sequence of packets for Netflow to consider them a network flow? (Choose three.)

• A. source IP address
• B. source MAC address
• C. egress interface
• D. ingress interface
• E. destination IP address
• F. IP next-hop

Answer: ADE

Explanation: Each packet that is forwarded within a router or switch is examined for a set of IP packet attributes. These attributes are the IP packet identity or fingerprint of the packet and determine if the packet is unique or similar to other packets.
Traditionally, an IP Flow is based on a set of 5 and up to 7 IP packet attributes. IP Packet attributes used by NetFlow:
• IP source address
• IP destination address
• Source port
• Destination port
• Layer 3 protocol type
• Class of Service
• Router or switch interface
All packets with the same source/destination IP address, source/destination ports, protocol interface and class of service are grouped into a flow and then packets and bytes are tallied. This methodology of fingerprinting or determining a flow is scalable because a large amount of network information is condensed into a database of NetFlow information called the NetFlow cache.
Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-
netflow/prod_white_paper0900aecd80406232.html

NEW QUESTION 16
What are three characteristics of the OSPF routing protocol? (Choose three.)

• A. It converges quickly.
• B. OSPF is a classful routing protocol.
• C. It uses cost to determine the best route.
• D. It uses the DUAL algorithm to determine the best route.
• E. OSPF routers send the complete routing table to all directly attached routers.
• F. OSPF routers discover neighbors before exchanging routing information.

Answer: ACF

Explanation: Additional OSPF features include equal-cost, multipath routing, and routing based on upper-layer type-of-service (TOS) requests. TOS-based routing supports those upper-layer protocols that can specify particular types of service. An application, for example, might specify that certain data is urgent. If OSPF has high-priority links at its disposal, these can be used to transport the urgent datagram.
OSPF supports one or more metrics. If only one metric is used, it is considered to be arbitrary, and TOS is not supported. If more than one metric is used, TOS is optionally supported through the use of a separate metric (and, therefore, a separate routing table) for each of the eight combinations created by the three IP TOS bits (the delay, throughput,
and reliability bits). For example, if the IP TOS bits specify low delay, low throughput, and high reliability, OSPF calculates routes to all destinations based on this TOS designation. IP subnet masks are included with each advertised destination, enabling variable-length subnet masks. With variable-length subnet masks, an IP network can be broken into many subnets of various sizes. This provides network administrators with extra network- configuration flexibility.