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2021 Mar 400-101 actual test
Q261. Refer to the exhibit.
Which additional information must you specify in this configuration to capture NetFlow traffic?
A. ingress or egress traffic
B. the number of cache entries
C. the flow cache active timeout
D. the flow cache inactive timeout
Answer: A
Explanation:
Configuring NetFlow
Perform the following task to enable NetFlow on an interface. SUMMARY STEPS
1. enable
2. configure terminal
3. interface type number
4. ip flow {ingress | egress}
5. exit
6. Repeat Steps 3 through 5 to enable NetFlow on other interfaces.
7. end
DETAILED STEPS
Command or Action
Purpose
Step 1
enable
Example:
Router> enable Enables privileged EXEC mode. .
Enter your password if prompted.
Step 2
configure terminal Example:
........
Example:
Router(config)# interface ethernet 0/0
Specifies the interface that you want to enable NetFlow on and enters interface configuration mode.
Step 4
ip flow {ingress | egress}
Example:
Router(config-if)# ip flow ingress
Enables NetFlow on the interface.
. ingress—Captures traffic that is being received by the interface
. egress—Captures traffic that is being transmitted by the interface
Step 5
exit
Example:
Router(config-if)# exit
(Optional) Exits interface configuration mode and enters global configuration mode.
Note
You need to use this command only if you want to enable NetFlow on another interface.
Step 6
Repeat Steps 3 through 5 to enable NetFlow on other interfaces.
This step is optional.
Step 7
end
Example:
Router(config-if)# end Exits the current configuration mode and returns to privileged EXEC mod
Reference: http://www.cisco.com/c/en/us/td/docs/ios/netflow/configuration/guide/12_2sr/nf_12_2sr_boo k/cfg_nflow_data_expt.html
Q262. While troubleshooting an issue for a remote user, you must capture the communication between the user's computer and a server at your location. The traffic passes through a Cisco IOS-XE capable switch. Which statement about obtaining the capture is true?
A. The Embedded Packet Capture application in the IOS-XE Software can capture the packets, but there is a performance impact.
B. The Embedded Packet Capture application in the IOS-XE Software can capture the packets without impacting performance.
C. The Mini Protocol Analyzer embedded in the IOS-XE Software can capture the packets without impacting performance.
D. The Mini Protocol Analyzer embedded in the IOS-XE Software can be used to capture the packets, but there is a performance impact.
E. Wireshark can capture packets through a SPAN port, but there is a performance impact.
Answer: A
Q263. Which statement about NAT64 is true?
A. It uses one-to-one mapping between IPv6 addresses and IPv4 addresses.
B. It requires static address mapping between IPv6 addresses and IPv4 addresses.
C. It can be used to translate an IPv6 network to another IPv6 network.
D. It can be configured for stateless and stateful translation.
Answer: D
Q264. How many address families can a single OSPFv3 instance support?
A. 1
B. 2
C. 5
D. 10
Answer: A
Q265. Which statement about the NHRP network ID is true?
A. It is sent from the spoke to the hub to identify the spoke as a member of the same NHRP domain.
B. It is sent from the hub to the spoke to identify the hub as a member of the same NHRP domain.
C. It is sent between spokes to identify the spokes as members of the same NHRP domain.
D. It is a locally significant ID used to define the NHRP domain for an interface.
Answer: D
Explanation:
The NHRP network ID is used to define the NHRP domain for an NHRP interface and differentiate between multiple NHRP domains or networks, when two or more NHRP domains (GRE tunnel interfaces) are available on the same NHRP node (router). The NHRP network ID is used to help keep two NHRP networks (clouds) separate from each other when both are configured on the same router. The NHRP network ID is a local only parameter. It is significant only to the local router and it is not transmitted in NHRP packets to other NHRP nodes. For this reason the actual value of the NHRP network ID configured on a router need not match the same NHRP network ID on another router where both of these routers are in the same NHRP domain. As NHRP packets arrive on a GRE interface, they are assigned to the local NHRP domain in the NHRP network ID that is configured on that interface.
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp.html
Refresh 400-101 braindumps:
Q266. Which two statements about the MAC address table space are true? (Choose two.)
A. You can disable learning on a VLAN to reduce table-space requirements.
B. When you disable learning on a VLAN with an SVI, IP packet flooding in the Layer 2 domain is also disabled.
C. Unicast, multicast, and broadcast MAC address filtering is configured globally and disabled by default.
D. The default setting for static MAC addresses to age out of the MAC address table is 300 seconds.
E. Turning off MAC learning on VLANs 900 through 1005 disables learning on VLANs 900 through 1001.
Answer: A,E
Q267. Which measure does IS-IS use to avoid sending traffic with a wrong MTU configuration?
A. IS-IS does not protect from MTU mismatch.
B. MTU value is communicated in IS-IS Sequence Number PDUs (SNP), and IS-IS adjacency is not established if an MTU mismatch is detected.
C. IS-IS uses path MTU discovery as specified in RFC 1063.
D. IS-IS uses padding of hello packets to full MTU.
Answer: D
Explanation:
Intermediate System-to-Intermediate System (IS-IS) hellos are padded to the full maximum transmission unit (MTU) size. The benefit of padding IS-IS Hellos (IIHs) to the full MTU is that it allows for early detection of errors due to transmission problems with large frames or due to mismatched MTUs on adjacent interfaces.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/47201-isis-mtu.html
Q268. Which statement describes what it means if a router has an OSPF priority set to 0?
A. A router with the OSPF priority set to 0 is one that can participate in the election of a DR. It has the highest priority.
B. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR, but it can become a BDR
C. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR. It can become neither a DR nor a BDR.
D. A router with the OSPF priority set to 0 is one that cannot participate in the election of a BDR, but it can become a DR
Answer: C
Q269. Which two protocols are not protected in an edge router by using control plane policing? (Choose two.)
A. SMTP
B. RPC
C. SSH
D. Telnet
Answer: A,B
Explanation:
A CoPP policy can limit a number of different packet types that are forwarded to the control plane. Traffic destined for the switch CPU includes:
. Address Resolution Protocol (ARP)
. First-hop redundancy protocol packets
. Layer 2 control packets
. Management packets (telnet, Secure Shell [SSH] Protocol, Simple Network Management Protocol [SNMP]) <--- C and D are not correct.
. Multicast control packets
. Routing protocol packets
. Packets with IP options
. Packets with time to live (TTL) set to 1
. Packets that require ACL logging
. Packets that require an initial lookup (first packet in a flow: FIB miss)
. Packets that have don't support hardware switching/routing
Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series-switches/white_paper_c11_553261.html
Q270. Which two statements about NetFlow are true? (Choose two.)
A. It must be configured on each router in a network.
B. It supports ATM LAN emulation.
C. The existing network is unaware that NetFlow is running.
D. It uses SIP to establish sessions between neighbors.
E. It provides resource utilization accounting.
Answer: C,E
Explanation:
NetFlow identifies packet flows for both ingress and egress IP packets. It does not involve any connection-setup protocol, either between routers or to any other networking device or end station. NetFlow does not require any change externally--either to the packets themselves or to any networking device. NetFlow is completely transparent to the existing network, including end stations and application software and network devices like LAN switches. Also, NetFlow capture and export are performed independently on each internetworking device; NetFlow need not be operational on each router in the network. NetFlow data provides fine-grained metering for highly flexible and detailed resource utilization accounting. For example, flow data includes details such as IP addresses, packet and byte counts, timestamps, type-of-service, and application ports. Service providers might utilize the information for billing based on time-of-day, bandwidth usage, application usage, or quality of service. Enterprise customers might utilize the information for departmental chargeback or cost allocation for resource utilization.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/netflow/configuration/12-4t/nf-12-4t-book/ios-netflow-ov.html