Exam Code: ccna 200 125 study guide (Practice Exam Latest Test Questions VCE PDF)
Exam Name: CCNA Cisco Certified Network Associate CCNA (v3.0)
Certification Provider: Cisco
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New Cisco 200-125 Exam Dumps Collection (Question 14 - Question 23)

Q1. In which three ways is an IPv6 header simpler than an IPv4 header? (Choose three.)

A. Unlike IPv4 headers, IPv6 headers have a fixed length.

B. IPv6 uses an extension header instead of the IPv4 Fragmentation field.

C. IPv6 headers eliminate the IPv4 Checksum field.

D. IPv6 headers use the Fragment Offset field in place of the IPv4 Fragmentation field.

E. IPv6 headers use a smaller Option field size than IPv4 headers.

F. IPv6 headers use a 4-bit TTL field, and IPv4 headers use an 8-bit TTL field.

Answer: A,B,C


Q2. Which NAT type is used to translate a single inside address to a single outside address?

A. dynamic NAT

B. NAT overload

C. PAT

D. static NAT

Answer: D

Explanation:

Network address translation (NAT) is the process ofmodifying IP addressinformation in IP packet headers while in transit across a traffic routing device.

There are two different types of NAT:

u2711 NAT

u2711 PAT


Q3. Which statement about routing protocols is true?

A. Link-state routing protocols choose a path by the number of hops to the destination.

B. OSPF is a link-state routing protocol.

C. Distance-vector routing protocols use the Shortest Path First algorithm.

D. IS-IS is a distance-vector routing protocol.

Answer: B

Explanation: Link State Routing Protocols

Link state protocols are also called shortest-path-first protocols. Link state routing protocols have a complete picture of the network topology. Hence they know more about the whole network than any distance vector protocol.

Three separate tables are created on each link state routing enabled router. One table is used to hold details about directly connected neighbors, one is used to hold the topology of the entire internetwork and the last one is used to hold the actual routing table.

Link state protocols send information about directly connected links to all the routers in the network. Examples of Link state routing protocols includeOSPF - Open Shortest Path FirstandIS-IS - Intermediate System to Intermediate System.

There are also routing protocols that are considered to be hybrid in the sense that they use aspects of both distance vector and link state protocols.EIGRP - Enhanced Interior Gateway Routing Protocolis one of those hybrid routing protocols.


Q4. Which EIGRP for IPv6 command can you enter to view the link-local addresses of the neighbors of a device?

A. show ipv6 eigrp 20 interfaces

B. show ipv6 route eigrp

C. show ipv6 eigrp neighbors

D. show ip eigrp traffic

Answer: C


Q5. Which three characteristics are representative of a link-state routing protocol? (Choose three.)

A. provides common view of entire topology

B. exchanges routing tables with neighbors

C. calculates shortest path

D. utilizes event-triggered updates

E. utilizes frequent periodic updates

Answer: A,C,D


Q6. What are three advantages of VLANs? (Choose three.)

A. They establish broadcast domains in switched networks.

B. They provide a low-latency internetworking alternative to routed networks.

C. They utilize packet filtering to enhance network security.

D. They can simplify adding, moving, or changing hosts on the network.

E. They allow access to network services based on department, not physical location.

F. They provide a method of conserving IP addresses in large networks.

Answer: A,D,E


Q7. Which Cisco platform can verify ACLs?

A. Cisco Prime Infrastructure

B. Cisco Wireless LAN Controller

C. Cisco APIC-EM

D. Cisco IOS-XE

Answer: B


Q8. Which three statements about DTP are true? (Choose three.)

A. It is enabled by default.

B. It is a universal protocol.

C. It is a proprietary protocol.

D. It is disabled by default.

E. It is a Layer 3-based protocol.

F. It is a Layer 2-based protocol.

Answer: A,C,F


Q9. Which two statements about using leased lines for your WAN infrastructure are true? (Choose two.)

A. Leased lines provide inexpensive WAN access.

B. Leased lines with sufficient bandwidth can avoid latency between endpoints.

C. Leased lines require little installation and maintenance expertise.

D. Leased lines provide highly flexible bandwidth scaling.

E. Multiple leased lines can share a router interface.

F. Leased lines support up to T1 link speeds.

Answer: B,C


Q10. Which statement about slow inter VLAN forwarding is true?

A. The VLAN is experiencing slowness in the point-to-point collisionless connection.

B. The VLANs are experiencing slowness because multiple devices are connected to the same hub.

C. The local VLAN is working normally, but traffic to the alternate VLAN is forwarded slower than expected.

D. The entire VLAN is experiencing slowness.

E. The VLANs are experiencing slowness due to a duplex mismatch.

Answer: E

Explanation:

Common Causes of Slow IntraVLAN and InterVLAN Connectivity

The symptoms of slow connectivity on a VLAN can be caused by multiple factors on different network layers. Commonly the network speed issue may be occurring on a lower level, but symptoms can be observed on a higher level as the problem masks itself under the term "slow VLAN". To clarify, this document defines the following new terms: "slow collision domain", "slow broadcast domain" (in other words, slow VLAN), and "slow interVLAN forwarding". These are defined in the sectionThree Categories of Causes, below.

In the following scenario (illustrated in the network diagram below), there is a Layer 3 (L3) switch performing interVLAN routing between the server and client VLANs. In this failure scenario, one server is connected to a switch, and the port duplex mode is configured half- duplex on the server side and full-duplex on the switch side. This misconfiguration results in a packet loss and slowness, with increased packet loss when higher traffic rates occur on the link where the server is connected. For the clients who communicate with this server, the problem looks like slow interVLAN forwarding because they do not have a problem communicating to other devices or clients on the same VLAN. The problem occurs only when communicating to the server on a different VLAN. Thus, the problem occurred on a single collision domain, but is seen as slow interVLAN forwarding.

Three Categories of Causes

The causes of slowness can be divided into three categories, as follows:

Slow Collision Domain Connectivity

Collision domain is defined as connected devices configured in a half-duplex port configuration, connected to each other or a hub. If a device is connected to a switch port and full-duplex mode is configured, such a point-to-point connection is collisionless.

Slowness on such a segment still can occur for different reasons.

Slow Broadcast Domain Connectivity (Slow VLAN)

Slow broadcast domain connectivity occurs when the whole VLAN (that is, all devices on the same VLAN) experiences slowness.

Slow InterVLAN Connectivity (Slow Forwarding Between VLANs)

Slow interVLAN connectivity (slow forwarding between VLANs) occurs when there is no slowness on the local VLAN, but traffic needs to be forwarded to an alternate VLAN, and it is not forwarded at the expected rate.

Causes for Network Slowness Packet Loss

In most cases, a network is considered slow when higher-layer protocols (applications) require extended time to complete an operation that typically runs faster. That slowness is caused by the loss of some packets on the network, which causes higher-level protocols like TCP or applications to time out and initiate retransmission.

Hardware Forwarding Issues

With another type of slowness, caused by network equipment, forwarding (whether Layer 2 [L2] or L3) is performed slowly. This is due to a deviation from normal (designed) operation and switching to slow path forwarding. An example of this is when Multilayer Switching (MLS) on the switch forwards L3 packets between VLANs in the hardware, but due to misconfiguration, MLS is not functioning properly and forwarding is done by the router in the software (which drops the interVLAN forwarding rate significantly).


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