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2021 Apr 400-101 exam answers
Q331. Which technology facilitates dynamic tunnel establishment in DMVPN?
A. CEF
B. mGRE
C. a dynamic routing protocol
D. NHRP
Answer: D
Q332. What are the three primary components of NetFlow? (Choose three.)
A. Flow caching
B. A flow collector
C. The data analyzer
D. Flow sequence numbers
E. Cisco Express Forwarding
F. Multicast
Answer: A,B,C
Explanation:
NetFlow includes three key components that perform the following capabilities:
. Flow caching analyzes and collects IP data flows entering router or switch interfaces and prepares data for export. It enables the accumulation of data on flows with unique characteristics, such as IP addresses, application, and CoS.
. FlowCollector and Data Analysis captures exported data from multiple routers and filters and aggregates the data according to customer policies, and then stores this summarized or aggregated data. Users can leverage Cisco NetFlow collector as a flow collector, or they can opt for a variety of third-party partner products. A Graphical user interface displays and analyzes NetFlow data collected from FlowCollector files. This allows users to complete near-real-time visualization or trending analysis of recorded and aggregated flow data. Users can specify the router and aggregation scheme and desired time interval.
Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-netflow/product_data_sheet0900aecd80173f71.html
Q333. Refer to the exhibit.
Which two statements about this configuration are true? (Choose two.)
A. It allows 172.16.0.0/16 to be distributed into EIGRP.
B. It allows a default route to be distributed into EIGRP.
C. It allows 172.16.0.0/16 and larger subnets to be distributed into EIGRP.
D. It prevents 172.16.0.0/16 from being distributed into EIGRP.
E. It prevents a default route from being distributed into EIGRP.
F. It creates summary routes and injects them into EIGRP.
Answer: A,B
Explanation:
In this example, the prefix list is configured to only allow the two specific routes of 172.16.0.0/16 and the default route. Any other routes will be filtered.
Q334. Refer to the exhibit.
You discover that only 1.5 Mb/s of web traffic can pass during times of congestion on the given network.
Which two options are possible reasons for this limitation? (Choose two.)
A. The web traffic class has too little bandwidth reservation.
B. Video traffic is using too much bandwidth.
C. The service-policy is on the wrong interface.
D. The service-policy is going in the wrong direction.
E. The NAT policy is adding too much overhead.
Answer: A,B
Explanation:
In this example, the web traffic will fall into the default class, which is only 15 percent of the 10Mbps Internet connection (1.5Mbps). Meanwhile, video traffic is allowed 50% of the 10 Mbps.
Q335. DRAG DROP
Drag and drop the TACACS+ configuration command on the left to the correct function it performs on the right.
Answer:
Avant-garde 400-101 exam guide:
Q336. Which two methods change the IP MTU value for an interface? (Choose two.)
A. Configure the default MTU.
B. Configure the IP system MTU.
C. Configure the interface MTU.
D. Configure the interface IP MTU.
Answer: C,D
Explanation:
An IOS device configured for IP+MPLS routing uses three different Maximum Transmission Unit (MTU) values: The hardware MTU configured with the mtu interface configuration command
. The IP MTU configured with the ip mtu interface configuration command
. The MPLS MTU configured with the mpls mtu interface configuration command
The hardware MTU specifies the maximum packet length the interface can support … or at least that's the theory behind it. In reality, longer packets can be sent (assuming the hardware interface chipset doesn't complain); therefore you can configure MPLS MTU to be larger than the interface MTU and still have a working network. Oversized packets might not be received correctly if the interface uses fixed-length buffers; platforms with scatter/gather architecture (also called particle buffers) usually survive incoming oversized packets.
IP MTU is used to determine whether am IP packet forwarded through an interface has to be fragmented. It has to be lower or equal to hardware MTU (and this limitation is enforced). If it equals the HW MTU, its value does not appear in the running configuration and it tracks the changes in HW MTU. For example, if you configure ip mtu 1300 on a Serial interface, it will appear in the running configuration as long as the hardware MTU is not equal to 1300 (and will not change as the HW MTU changes). However, as soon as the mtu 1300 is configured, the ip mtu 1300 command disappears from the configuration and the IP MTU yet again tracks the HW MTU.
Reference: http://blog.ipspace.net/2007/10/tale-of-three-mtus.html
Q337. Which two statements about SNMP traps are true? (Choose two.)
A. They are sent by an agent after a specified event.
B. They are sent when solicited after a specified event.
C. They are equivalent to a community string.
D. They provide solicited data to the manager.
E. They are sent by a management station to an agent.
F. Vendor-specific traps can be configured.
Answer: A,F
Explanation:
The SNMP agent contains MIB variables whose values the SNMP manager can request or change. A manager can get a value from an agent or store a value into the agent. The agent gathers data from the MIB, the repository for information about device parameters and network data. The agent can also respond to a manager's requests to get or set data. An agent can send unsolicited traps to the manager. Traps are messages alerting the SNMP manager to a condition on the network. Traps can mean improper user authentication, restarts, link status (up or down), MAC address tracking, closing of a TCP connection, loss of connection to a neighbor, or other significant events.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_55_se/configuration/guide/scg_2960/swsnmp.html
Q338. DRAG DROP
Drag and drop the OSPF network type on the left to the correct category of timers on the right.
Answer:
Q339. Refer to the exhibit.
You are configuring the S1 switch for the switchport connecting to the client computer. Which option describes the effect of the command mls qos map cos-dscp 0 8 16 24 32 40 46 56?
A. Voice traffic is excluded from the default priority queue.
B. Voice packets are given a class selector of 5.
C. Video conferencing is marked CS3.
D. Voice packets are processed in the priority queue.
Answer: A
Explanation:
The default CoS to DSCP mappings are shown below:
Default CoS-to-DSCP Map
CoS Value
DSCP Value
0
0
1
8
2
16
3
24
4
32
5
40
6
48
7
56
In our example, we see that COS 6 is mapped to DSCP, not the default of DSCP 48 as shown above. DSCP 46 is Expedited Forwarding (EF), which is typically used for voice traffic, and this value has not been included in this class map.
Q340. Which three TLVs does LLDP use to discover network devices? (Choose three.)
A. Management address
B. Port description
C. Network policy
D. System name
E. Location information
F. Power management
Answer: A,B,D
Explanation:
Basic Management TLV Set
This set includes the following five TLVs used in LLDP:
. Port description TLV: Provides a description of the port in an alpha-numeric format. The value equals the ifDescr object, if the LAN device supports RFC 2863.
. System name TLV: Provides the system's assigned name in an alpha-numeric format. The value equals the sysName object, if the LAN device supports RFC 3418.
. System description TLV: Provides a description of the network entity in an alpha-numeric format. This includes system's name and versions of hardware, operating system and networking software supported in the device. The value equals the sysDescr object, if the LAN device supports RFC 3418.
. System capabilities TLV: Indicates the primary function(s) of the device and whether or not these functions are enabled in the device. The capabilities are indicated by two octects. Bits 0 through 7 indicate Other, Repeater, Bridge, WLAN AP, Router, Telephone, DOCSIS cable device and Station respectively. Bits 8 through 15 are reserved.
. Management address TLV: Indicates the addresses of the local LLDP agent. Other remote managers can use this address to obtain information related to the local device.
Reference: http://www.eetimes.com/document.asp?doc_id=1272069