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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
After the recent upgrade of the switching infrastructure, the network engineer notices that the port roles that were once “blocking” are now defined as “alternate” and “backup.” What is the reason for this change?
A. The new switches are using RSTP instead of legacy IEEE 802.1D STP.
B. IEEE 802.1D STP and PortFast have been configured by default on all newly implemented Cisco Catalyst switches.
C. The administrator has defined the switch as the root in the STP domain.
D. The port roles have been adjusted based on the interface bandwidth and timers of the new Cisco Catalyst switches.
Correct Answer: A
RSTP works by adding an alternative port and a backup port compared to STP. These ports are allowed to immediately enter the forwarding state rather than passively wait for the network to converge. RSTP bridge port roles: Root port A forwarding port that is the closest to the root bridge in terms of path cost Designated port A forwarding port for every LAN segment Alternate port A best alternate path to the root bridge. This path is different than using the root port. The alternative port moves to the forwarding state if there is a failure on the designated port for the segment. Backup port A backup/redundant path to a segment where another bridge port already connects. The backup port applies only when a single switch has two links to the same segment (collision domain). To have two links to the same collision domain, the switch must be attached to a hub. Disabled port Not strictly part of STP, a network administrator can manually disable a port Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/ spanning-tree- protocol/24062-146.html
A network engineer tries to configure storm control on an EtherChannel bundle. What is the result of the configuration?
A. The storm control settings will appear on the EtherChannel, but not on the associated physical ports.
B. The configuration will be rejected because storm control is not supported for EtherChannel.
C. The storm control configuration will be accepted, but will only be present on the physical interfaces.
D. The settings will be applied to the EtherChannel bundle and all associated physical interfaces.
Correct Answer: D
After you configure an EtherChannel, any configuration that you apply to the port-channel interface affects the EtherChannel; any configuration that you apply to the physical interfaces affects only the interface where you apply the configuration. Storm Control is an exception to this rule. For example, you cannot configure Storm Control on some of the members of an EtherChannel; Storm Control must be configured on all or none of the ports. If you configure Storm Control on only some of the ports, those ports will be dropped from the EtherChannel interface (put in suspended state). Therefore, you should configure Storm Control at the EtherChannel Interface level, and not at the physical interface level. Reference: http:// www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12- 2/31sg/ configuration/guide/ conf/ channel.html
Refer to the exhibit.
A network engineer investigates a recent network failure and notices that one of the interfaces on the switch is still down. What is causing the line protocol on this interface to be shown as down?
A. There is a layer 1 physical issue.
B. There is a speed mismatch on the interface.
C. The interface is configured as the target of the SPAN session.
D. The interface is configured as the source of the SPAN session.
E. There is a duplex mismatch on the interface.
Correct Answer: C
With the SAPN destination port, the state of the destination port is up/down by design. The interface shows the port in this state in order to make it evident that the port is currently not usable as a production port. This is the normal operational
state for SPAN destinations.
Which option lists the information that is contained in a Cisco Discovery Protocol advertisement?
A. native VLAN IDs, port-duplex, hardware platform
B. native VLAN IDs, port-duplex, memory errors
C. native VLAN IDs, memory errors, hardware platform
D. port-duplex, hardware platform, memory errors
Correct Answer: A
Type-Length-Value fields (TLVs) are blocks of information embedded in CDP advertisements. Table 21 summarizes the TLV definitions for CDP advertisements. Table 21 Type-Length-Value Definitions for CDPv2
TLV Definition Device-ID TLV Identifies the device name in the form of a character string. Address TLV Contains a list of network addresses of both receiving and sending devices. Port-ID TLV Identifies the port on which the CDP packet is sent. Capabilities TLV Describes the functional capability for the device in the form of a de- vice type, for example, a switch. Version TLV Contains information about the software release version on which the device is running. Platform TLV Describes the hardware platform name of the device, for example, Cisco 4500. IP Network Prefix Contains a list of network prefixes to which the sending device can TLV forward IP packets. This information is in the form of the interface
protocol and port number, for example, Eth 1/0.
VTP Management Advertises the system\’s configured VTP management domain name- Domain TLV string. Used by network operators to verify VTP domain configuration in adjacent network nodes. Native VLAN TLV Indicates, per interface, the assumed VLAN for untagged packets on the interface. CDP learns the native VLAN for an interface. This fea- ture is
implemented only for interfaces that support the IEEE 802.1Q protocol.
Full/Half Duplex Indicates status (duplex configuration) of CDP broadcast interface. TLV Used by network operators to diagnose connectivity problems be- tween adjacent network elements. Reference:
What is required for a LAN switch to support 802.1q Q-in-Q encapsulation?
A. Support less than 1500 MTU
B. Support 1504 MTU or higher
C. Support 1522 layer 3 IP and IPX packet
D. Support 1547 MTU only
Correct Answer: B
The default system MTU for traffic on Catalyst switches is 1500 bytes. Because the 802.1Q tunneling (Q- in-Q) feature increases the frame size by 4 bytes when the extra tag is added, you must configure all switches in the service-provider network to be able to process maximum frames by increasing the switch system MTU size to at least 1504 bytes. http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.1_13_ea1/confi guration/ guide/swtunnel.html
Which AAA Authorization type includes PPP, SLIP, and ARAP connections?
B. IP mobile
Correct Answer: A
Explanation: Method lists for authorization define the ways that authorization will be performed and the sequence in which these methods will be performed. A method list is simply a named list describing the authorization methods to be
queried (such as RADIUS or TACACS ), in sequence. Method lists enable you to designate one or more security protocols to be used for authorization, thus ensuring a backup system in case the initial method fails. Cisco IOS software uses
the first method listed to authorize users for specific network services; if that method fails to respond, the Cisco IOS software selects the next method listed in the method list. This process continues until there is successful communication
with a listed authorization method, or all methods defined are exhausted. Method lists are specific to the authorization type requested:
Auth-proxy–Applies specific security policies on a per-user basis. For detailed information on the authentication proxy feature, refer to the chapter “Configuring Authentication Proxy” in the “Traffic Filtering and Firewalls” part of this book.
Commands–Applies to the EXEC mode commands a user issues. Command authorization attempts authorization for all EXEC mode commands, including global configuration commands, associated with a specific privilege level.
EXEC–Applies to the attributes associated with a user EXEC terminal session. etwork–Applies to network connections. This can include a PPP, SLIP, or ARAP connection.
Reverse Access–Applies to reverse Telnet sessions.
When you create a named method list, you are defining a particular list of authorization methods for the indicated authorization type.
Which switch feature determines validity based on IP-to-MAC address bindings that are stored in a trusted database?
A. Dynamic ARP Inspection
B. storm control
C. VTP pruning
D. DHCP snooping
Correct Answer: A
Explanation: Dynamic ARP inspection determines the validity of an ARP packet based on valid IP-to-MAC address bindings stored in a trusted database, the DHCP snooping binding database. This database is built by DHCP snooping if DHCP snooping is enabled on the VLANs and on the switch. If the ARP packet is received on a trusted interface, the switch forwards the packet without any checks. On untrusted interfaces, the switch forwards the packet only if it is valid. Reference: http:// www.cisco.com/c/en/us/ support/docs/switches/catalyst-3750-series- switches/72846-layer2-secftrs-catl3fixed.html
Which command is needed to enable DHCP snooping if a switchport is connected to a DHCP server?
A. ip dhcp snooping trust
B. ip dhcp snooping
C. ip dhcp trust
D. ip dhcp snooping information
Correct Answer: A
When configuring DHCP snooping, follow these guidelines:
DHCP snooping is not active until you enable the feature on at least one VLAN, and enable DHCP globally on the switch. Before globally enabling DHCP snooping on the switch, make sure that the devices acting as the DHCP server and the
DHCP relay agent are configured and enabled. If a Layer 2 LAN port is connected to a DHCP server, configure the port as trusted by entering the “ip dhcp snooping trust” interface configuration command.
If a Layer 2 LAN port is connected to a DHCP client, configure the port as untrusted by entering the no ip dhcp snooping trust interface configuration command. Reference: http://www.cisco.com/c/en/us/td/docs/ switches/lan/catalyst6500/
Which private VLAN access port belongs to the primary VLAN and can communicate with all interfaces, including the community and isolated host ports?
A. promiscuous port
B. isolated port
C. community port
D. trunk port
Correct Answer: A
The types of private VLAN ports are as follows: Promiscuous–A promiscuous port belongs to the primary VLAN. The promiscuous port can communicate with all interfaces, including the community and isolated host ports, that belong to those secondary VLANs associated to the promiscuous port and associated with the primary VLAN. You can have several promiscuous ports in a primary VLAN. Each promiscuous port can have several secondary VLANs, or no secondary VLANs, associated to that port. You can associate a secondary VLAN to more than one promiscuous port, as long as the promiscuous port and secondary VLANs are within the same primary VLAN. You may want to do this for load-balancing or redundancy purposes. You can also have secondary VLANs that are not associated to any promiscuous port. Isolated–An isolated port is a host port that belongs to an isolated secondary VLAN. This port has complete isolation from other ports within the same private VLAN domain, except that it can communicate with associated promiscuous ports. Private VLANs block all traffic to isolated ports except traffic from promiscuous ports. Traffic received from an isolated port is forwarded only to promiscuous ports. You can have more than one isolated port in a specified isolated VLAN. Each port is completely isolated from all other ports in the isolated VLAN. Community–A community port is a host port that belongs to a community secondary VLAN. Community ports communicate with other ports in the same community VLAN and with associated promiscuous ports. These interfaces are isolated from all other interfaces in other communities and from all isolated ports within the private VLAN domain. Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/ cli/ CLIConfigurationGuide/PrivateVLANs.html
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