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Exam Implementing Cisco IP Switched Networks (SWITCH v2.0)
Number 300-115
File Name Implementing Cisco IP Switched Networks (SWITCH v2-0).actualtests.300-115.2019-05-27.1e.501q.vcex
Size 13.89 Mb
Posted May 27, 2019
Downloads 280


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Demo Questions

Question 1
What is the maximum number of switches that can be stacked using Cisco StackWise?

  • A: 4
  • B: 5
  • C: 8
  • D: 9
  • E: 10
  • F: 13
Correct Answer: D
Up to 9 Cisco Catalyst switches can be stacked together to build single logical StackWise switch since Cisco IOS XE Release 3.3.0SE. Prior to Cisco IOS XE Release3.3.0SE, up to 4 Cisco Catalyst switches could be stacked together.  
Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3850-series-switches/qa_c67-722110.html



Question 2
What percentage of bandwidth is reduced when a stack cable is broken?

  • A: 0
  • B: 25
  • C: 50
  • D: 75
  • E: 100
Correct Answer: C
Physical Sequential Linkage  
The switches are physically connected sequentially, as shown in Figure 3. A break in any one of the cables will result in the stack bandwidth being reduced to half of its full capacity. Subsecond timing mechanisms detect traffic problems and immediately institute failover. This mechanism restores dual path flow when the timing mechanisms detect renewed activity on the cable.  
Figure 3. Cisco StackWise Technology Resilient Cabling 

  

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-series-switches/prod_white_paper09186a00801b096a.html



Question 3
  

A network engineer wants to analyze all incoming and outgoing packets for an interface that is connected to an access switch. Which three items must be configured to mirror traffic to a packet sniffer that is connected to the distribution switch? (Choose three.)

  • A: A monitor session on the distribution switch with a physical interface as the source and the remote SPAN VLAN as the destination
  • B: A remote SPAN VLAN on the distribution and access layer switch
  • C: A monitor session on the access switch with a physical interface source and the remote SPAN VLAN as the destination
  • D: A monitor session on the distribution switch with a remote SPAN VLAN as the source and physical interface as the destination
  • E: A monitor session on the access switch with a remote SPAN VLAN source and the physical interface as the destination
  • F: A monitor session on the distribution switch with a physical interface as the source and a physical interface as the destination
Correct Answer: BCD
You can analyze network traffic passing through ports or VLANs by using SPAN or RSPAN to send a copy of the traffic to another port on the switch or on another switch that has been connected to a network analyzer or other monitoring or security device. SPAN copies (or mirrors) traffic received or sent (or both) on source ports or source VLANs to a destination port for analysis. 
RSPAN supports source ports, source VLANs, and destination ports on different switches (or different switch stacks), enabling remote monitoring of multiple switches across your network. The traffic for each RSPAN session is carried over a user-specified RSPAN VLAN that is dedicated for that RSPAN session in all participating switches. The RSPAN traffic from the source ports or VLANs is copied into the RSPAN VLAN and forwarded over trunk ports carrying the RSPAN VLAN to a destination session monitoring the RSPAN VLAN. Each RSPAN source switch must have either ports or VLANs as RSPAN sources. The destination is always a physical port. 
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swspan.html



Question 4
After an EtherChannel is configured between two Cisco switches, interface port channel 1 is in the down/down state. Switch A is configured with channel-group 1 mode active, while Switch B is configured with channel-group 1 mode desirable. Why is the EtherChannel bundle not working?

  • A: The switches are using mismatched EtherChannel negotiation modes.
  • B: The switch ports are not configured in trunking mode.
  • C: LACP priority must be configured on both switches.
  • D: The channel group identifier must be different for Switch A and Switch B.
Correct Answer: A
Here we have a situation where one switch is using active mode, which is an LACP mode, and the other is using desirable, which is a PAGP mode. You can not mix the LACP and PAGP protocols to form an etherchannel. Here is a summary of the various etherchannel modes:

  

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_55_se/configuration/guide/scg_2960/swethchl.html



Question 5
An EtherChannel bundle has been established between a Cisco switch and a corporate web server. The network administrator noticed that only one of the EtherChannel links is being utilized to reach the web server.  
What should be done on the Cisco switch to allow for better EtherChannel utilization to the corporate web server?

  • A: Enable Cisco Express Forwarding to allow for more effective traffic sharing over the EtherChannel bundle.
  • B: Adjust the EtherChannel load-balancing method based on destination IP addresses.
  • C: Disable spanning tree on all interfaces that are participating in the EtherChannel bundle.
  • D: Use link-state tracking to allow for improved load balancing of traffic upon link failure to the server.
  • E: Adjust the EtherChannel load-balancing method based on source IP addresses.
Correct Answer: E
EtherChannel load balancing can use MAC addresses, IP addresses, or Layer 4 port numbers, and either source mode, destination mode, or both. The mode you select applies to all EtherChannels that you configure on the switch. Use the option that provides the greatest variety in your configuration. For example, if the traffic on a channel only goes to a single MAC address (which is the case in this example, since all traffic is going to the same web server), use of the destination MAC address results in the choice of the same link in the channel each time. Use of source addresses or IP addresses can result in a better load balance. 
Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/etherchannel/12023-4.html



Question 6
Interface FastEthernet0/1 is configured as a trunk interface that allows all VLANs. This command is configured globally:
monitor session 2 filter vlan 1 – 8, 39, 52 
What is the result of the implemented command?

  • A: All VLAN traffic is sent to the SPAN destination interface.
  • B: Traffic from VLAN 4 is not sent to the SPAN destination interface.
  • C: Filtering a trunked SPAN port effectively disables SPAN operations for all VLANs.
  • D: The trunk’s native VLAN must be changed to something other than VLAN 1.
  • E: Traffic from VLANs 1 to 8, 39, and 52 is replicated to the SPAN destination port.
Correct Answer: E
The “monitor session filter” command is used to specify which VLANS are to be port mirrored using SPAN. This example shows how to monitor VLANs 1 through 5 and VLAN 9 when the SPAN source is a trunk interface: 
Switch(config)# monitor session 2 filter vlan 1 – 5 , 9 
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/25ew/configuration/guide/conf/span.html/index.html#wp1066836



Question 7
After the implementation of several different types of switches from different vendors, a network engineer notices that directly connected devices that use Cisco Discovery Protocol are not visible.  
Which vendor-neutral protocol could be used to resolve this issue?

  • A: Local Area Mobility
  • B: Link Layer Discovery Protocol
  • C: NetFlow
  • D: Directed Response Protocol
Correct Answer: B
The Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol in the Internet Protocol Suite used by network devices for advertising their identity, capabilities, and neighbors on an IEEE 802 local area network, principally wired Ethernet. LLDP performs functions similar to several proprietary protocols, such as the Cisco Discovery Protocol (CDP). 
Reference: http://en.wikipedia.org/wiki/Link_Layer_Discovery_Protocol



Question 8
Several new switches have been added to the existing network as VTP clients. All of the new switches have been configured with the same VTP domain, password, and version. However, VLANs are not passing from the VTP server (existing network) to the VTP clients.  
What must be done to fix this?

  • A: Remove the VTP domain name from all switches with "null" and then replace it with the new domain name.
  • B: Configure a different native VLAN on all new switches that are configured as VTP clients.
  • C: Provision one of the new switches to be the VTP server and duplicate information from the existing network.
  • D: Ensure that all switch interconnects are configured as trunks to allow VTP information to be transferred.
Correct Answer: D
VTP allows switches to advertise VLAN information between other members of the same VTP domain. VTP allows a consistent view of the switched network across all switches. There are several reasons why the VLAN information can fail to be exchanged. 
Verify these items if switches that run VTP fail to exchange VLAN information:
VTP information only passes through a trunk port. Make sure that all ports that interconnect switches are configured as trunks and are actually trunking. 
Make sure that if EtherChannels are created between two switches, only Layer 2 EtherChannels propagate VLAN information. 
Make sure that the VLANs are active in all the devices. 
One of the switches must be the VTP server in a VTP domain. All VLAN changes must be done on this switch in order to have them propagated to the VTP clients. 
The VTP domain name must match and it is case sensitive. CISCO and cisco are two different domain names. 
Make sure that no password is set between the server and client. If any password is set, make sure that the password is the same on both sides. 
Reference: http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080890613.shtml



Question 9
  

Switch A, B, and C are trunked together and have been properly configured for VTP. Switch C receives VLAN information from the VTP server Switch A, but Switch B does not receive any VLAN information. What is the most probable cause of this behavior?

  • A: Switch B is configured in transparent mode.
  • B: Switch B is configured with an access port to Switch A, while Switch C is configured with a trunk port to Switch B.
  • C: The VTP revision number of the Switch B is higher than that of Switch A.
  • D: The trunk between Switch A and Switch B is misconfigured.
Correct Answer: A
VTP transparent switches do not participate in VTP. A VTP transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements, but transparent switches do forward VTP advertisements that they receive out their trunk ports in VTP Version 2. 
Reference: http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml



Question 10
An administrator recently configured all ports for rapid transition using PortFast. After testing, it has been determined that several ports are not transitioning as they should.  
What is the reason for this?

  • A: RSTP has been enabled per interface and not globally.
  • B: The STP root bridge selection is forcing key ports to remain in non-rapid transitioning mode.
  • C: STP is unable to achieve rapid transition for trunk links.
  • D: The switch does not have the processing power to ensure rapid transition for all ports.
Correct Answer: C
RSTP can only achieve rapid transition to the forwarding state on edge ports and on point-to-point links, not on trunk links. The link type is automatically derived from the duplex mode of a port. A port that operates in full-duplex is assumed to be point-to-point, while a half-duplex port is considered as a shared port by default. This automatic link type setting can be overridden by explicit configuration. In switched networks today, most links operate in full-duplex mode and are treated as point-to-point links by RSTP. This makes them candidates for rapid transition to the forwarding state. 
Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html









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