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December 24, 2018

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New Cisco 200-125 Exam Dumps Collection (Question 1 - Question 10)

Q1. Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network? (Choose two.)

A. 802.1d

B. VTP

C. 802.1q

D. STP

E. SAP

Answer: A,D

Explanation:

This question is to examine the STP protocol. STP (802.1d) is used to prevent Layer 2 loops.

802.1q is a Frame Relay protocol which belongs to VLAN. SAP is a concept of the OSI model.



Q2. Why do large OSPF networks use a hierarchical design? (Choose three.)

A. to decrease latency by increasing bandwidth

B. to reduce routing overhead

C. to speed up convergence

D. to confine network instability to single areas of the network

E. to reduce the complexity of router configuration

F. to lower costs by replacing routers with distribution layer switches

Answer: B,C,D

Explanation:

OSPF implements a two-tier hierarchical routing model that uses a core or backbone tier known as area zero (0). Attached to that backbone via area border routers (ABRs) are a number of secondary tier areas. The hierarchical approach is used to achieve the following:

u2022Rapid convergence because of link and/or switch failures

u2022Deterministic traffic recovery

u2022Scalable and manageable routing hierarchy, reduced routing overhead.



Q3. What will happen if a private IP address is assigned to a public interface connected to an ISP?

A. Addresses in a private range will not be routed on the Internet backbone.

B. Only the ISP router will have the capability to access the public network.

C. The NAT process will be used to translate this address to a valid IP address.

D. A conflict of IP addresses happens, because other public routers can use the same range.

Answer: A

Explanation:

Private RFC 1918 IP addresses are meant to be used by organizations locally within their own network only, and cannot be used globally for Internet use.



Q4. Based on the network shown in the graphic

Which option contains both the potential networking problem and the protocol or setting that should be used to prevent the problem?

A. routing loops, hold down timers

B. switching loops, split horizon

C. routing loops, split horizon

D. switching loops, VTP

E. routing loops, STP

F. switching loops, STP

Answer: F

Explanation:

The Spanning-Tree Protocol (STP) prevents loops from being formed when switches or bridges are interconnected via multiple paths. Spanning-Tree Protocol implements the 802.1D IEEE algorithm by exchanging BPDU messages with other switches to detect loops, and then removes the loop by shutting down selected bridge interfaces. This algorithm guarantees that there is one and only one active path between two network devices.



Q5. Refer to the exhibit.

Which statement is true?

A. The Fa0/11 role confirms that SwitchA is the root bridge for VLAN 20.

B. VLAN 20 is running the Per VLAN Spanning Tree Protocol.

C. The MAC address of the root bridge is 0017.596d.1580.

D. SwitchA is not the root bridge, because not all of the interface roles are designated.

Answer: D

Explanation:

Only non-root bridge can have root port. Fa0/11 is the root port so we can confirm this

switch is not the root bridge ->.

From the output we learn this switch is running Rapid STP, not PVST ->. 0017.596d.1580 is the MAC address of this switch, not of the root bridge. The MAC address of the root bridge is 0017.596d.2a00 ->.

All of the interface roles of the root bridge are designated. SwitchA has one Root port and 1 Alternative port so it is not the root bridge.



Q6. Refer to the exhibit.

For what two reasons has the router loaded its IOS image from the location that is shown? (Choose two.)

A. Router1 has specific boot system commands that instruct it to load IOS from a TFTP server.

B. Router1 is acting as a TFTP server for other routers.

C. Router1 cannot locate a valid IOS image in flash memory.

D. Router1 defaulted to ROMMON mode and loaded the IOS image from a TFTP server.

E. Cisco routers will first attempt to load an image from TFTP for management purposes.

Answer: A,C

Explanation:

The loading sequence of CISCO IOS is as follows: Booting up the router and locating the Cisco IOS

1. POST (power on self-test)

2. Bootstrap code executed

3. Check Configuration Register value (NVRAM) which can be modified using the config- register command

0 = ROM Monitor mode 1 = ROM IOS

2 - 15 = startup-config in NVRAM

4. Startup-config filE. Check for boot system commands (NVRAM)

If boot system commands in startup-config

a. Run boot system commands in order they appear in startup-config to locate the IOS

b. [If boot system commands fail, use default fallback sequence to locate the IOS (Flash, TFTP, ROM)?]

If no boot system commands in startup-config use the default fallback sequence in locating the IOS:

a. Flash (sequential)

b. TFTP server (netboot)

c. ROM (partial IOS) or keep retrying TFTP depending upon router model

5. If IOS is loaded, but there is no startup-config file, the router will use the default fallback sequence for locating the IOS and then it will enter setup mode or the setup dialogue.



Q7. Refer to the exhibit.

The output that is shown is generated at a switch. Which three statements are true? (Choose three.)

A. All ports will be in a state of discarding, learning, or forwarding.

B. Thirty VLANs have been configured on this switch.

C. The bridge priority is lower than the default value for spanning tree.

D. All interfaces that are shown are on shared media.

E. All designated ports are in a forwarding state.

F. This switch must be the root bridge for all VLANs on this switch.

Answer: A,C,E

Explanation:

From the output, we see that all ports are in designated role (forwarding state).

The command u201cshow spanning-tree vlan 30 only shows us information about VLAN 30. We donu2019t know how many VLAN exists in this switch ->.

The bridge priority of this switch is 24606 which is lower than the default value bridge priority 32768.

All three interfaces on this switch have the connection type u201cp2pu201d, which means Point-to- point environment u2013 not a shared media.

The only thing we can specify is this switch is the root bridge for VLAN 3o but we cannot guarantee it is also the root bridge for other VLANs.



Q8. Which term describes a spanning-tree network that has all switch ports in either the blocking or forwarding state?

A. converged

B. redundant

C. provisioned

D. spanned

Answer: A

Explanation:

Spanning Tree Protocol convergence (Layer 2 convergence) happens when bridges and switches have transitioned to either the forwarding or blocking state. When layer 2 is converged, root bridge is elected and all port roles (Root, Designated and Non-Designated) in all switches are selected.



Q9. Which two link protocols are used to carry multiple VLANs over a single link? (Choose two.)

A. VTP

B. 802.1q

C. IGP

D. ISL

E. 802.3u

Answer: B,D

Explanation:

Cisco switches can use two different encapsulation types for trunks, the industry standard 802.1q or the Cisco proprietary ISL. Generally, most network engineers prefer to use 802.1q since it is standards based and will interoperate with other vendors.



Q10. Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over Fast Ethernet?

A. 802.3ad

B. 802.1w

C. 802.1D

D. 802.1Q

Answer: D

Explanation:

Dynamic Trunking Protocol (DTP) is a Cisco proprietary protocol for negotiating trunking on a link between two devices and for negotiating the type of trunking encapsulation (802.1Q) to be used.




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