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Q51. Two aspects of an IP SLA operation can be tracked: state and reachability. Which statement about state tracking is true?
A. When tracking state, an OK return code means that the track's state is up; any other return code means that the track's state is down.
B. When tracking state, an OK or over threshold return code means that the track's state is up; any other return code means that the track's state is down.
C. When tracking state, an OK return code means that the track's state is down; any other return code means that the track's state is up.
D. When tracking state, an OK or over threshold return code means that the track's state is down; any other return code means that the track's state is up.
Answer: A
Explanation:
Q52. Refer to the exhibit. The network setup is running the RIP routing protocol. Which two events will occur following link failure between R2 and R3? (Choose two.)
A. R2 will advertise network 192.168.2.0/27 with a hop count of 16 to R1.
B. R2 will not send any advertisements and will remove route 192.168.2.0/27 from its routing table.
C. R1 will reply to R2 with the advertisement for network 192.168.2.0/27 with a hop count of 16.
D. After communication fails and after the hold-down timer expires, R1 will remove the 192.168.2.0/27 route from its routing table.
E. R3 will not accept any further updates from R2, due to the split-horizon loop prevention mechanism.
Answer: A,C
Explanation:
Q53. Scenario:
You have been asked to evaluate an OSPF network setup in a test lab and to answer questions a customer has about its operation. The customer has disabled your access to the show running-config command.
How old is the Type 4 LSA from Router 3 for area 1 on the router R5 based on the output you have examined?
A. 1858
B. 1601
C. 600
D. 1569
Answer: A
Explanation:
Q54. Which statement about the NPTv6 protocol is true?
A. It is used to translate IPv4 prefixes to IPv6 prefixes.
B. It is used to translate an IPv6 address prefix to another IPv6 prefix.
C. It is used to translate IPv6 prefixes to IPv4 subnets with appropriate masks.
D. It is used to translate IPv4 addresses to IPv6 link-local addresses.
Answer: B
Explanation:
Q55. A network engineer is trying to implement broadcast-based NTP in a network and executes the ntp broadcast client command. Assuming that an NTP server is already set up, what is the result of the command?
A. It enables receiving NTP broadcasts on the interface where the command was executed.
B. It enables receiving NTP broadcasts on all interfaces globally.
C. It enables a device to be an NTP peer to another device.
D. It enables a device to receive NTP broadcast and unicast packets.
Answer: A
Explanation:
The NTP service can be activated by entering any ntp command. When you use the ntp broadcast client
command, the NTP service is activated (if it has not already been activated) and the device is configured to receive NTP broadcast packets on a specified interface simultaneously.
Command Description
ntp broadcast Allows the system to receive NTP broadcast packets on an client interface.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/bsm/command/bsm-xe-3se-3850- cr-book/
bsm-xe-3se-3850-cr-book_chapter_00.html
Q56. What is a function of NPTv6?
A. It interferes with encryption of the full IP payload.
B. It maintains a per-node state.
C. It is checksum-neutral.
D. It rewrites transport layer headers.
Answer: C
Explanation:
RFC 6296 describes a stateless IPv6-to-IPv6 Network Prefix Translation (NPTv6) function,
designed to provide address independence to the edge network. It is transport-agnostic with respect to
transports that do not checksum the IP header, such as SCTP, and to transports that use the TCP/UDP/
DCCP (Datagram Congestion Control Protocol) pseudo-header and checksum NPTv6 provides a simple
and compelling solution to meet the address-independence requirement in IPv6. The addressindependence
benefit stems directly from the translation function of the network prefix translator. To avoid
as many of the issues associated with NAPT44 as possible, NPTv6 is defined to include a two-way,
checksum-neutral, algorithmic translation function, and nothing else. Reference: http://tools.ietf.org/html/
rfc6296
Q57. Refer to the exhibit.
Which statement about the output of the show flow-sampler command is true?
A. The sampler matched 10 packets, each packet randomly chosen from every group of 100 packets.
B. The sampler matched 10 packets, one packet every 100 packets.
C. The sampler matched 10 packets, each one randomly chosen from every 100-second interval.
D. The sampler matched 10 packets, one packet every 100 seconds.
Answer: A
Explanation:
The sampling mode determines the algorithm that selects a subset of traffic for NetFlow
processing. In the random sampling mode that Random Sampled NetFlow uses, incoming packets are
randomly selected so that one out of each n sequential packets is selected on average for NetFlow
processing. For example, if you set the sampling rate to 1 out of 100 packets, then NetFlow might sample
the 5th, 120th, 199th, 302nd, and so on packets. This sample configuration provides NetFlow data on 1
percent of total traffic. The n value is a parameter from 1 to 65535 packets that you can configure. Table 2
show flow-sampler Field Descriptions Field Description Sampler Name of the flow sampler id Unique ID of
the flow sampler packets matched Number of packets matched for the flow sampler mode Flow sampling
mode sampling interval is Flow sampling interval (in packets) Reference: http://www.cisco.com/c/en/us/td/
docs/ios/12_0s/feature/guide/nfstatsa.html#wp1084291
Q58. IPv6 has just been deployed to all of the hosts within a network, but not to the servers. Which feature allows IPv6 devices to communicate with IPv4 servers?
A. NAT
B. NATng
C. NAT64
D. dual-stack NAT
E. DNS64
Answer: C
Explanation:
NAT64 is a mechanism to allow IPv6 hosts to communicate with IPv4 servers. The NAT64 server is the
endpoint for at least one IPv4 address and an IPv6 network segment of 32-bits (for instance 64:ff9b::/96, see RFC 6052, RFC 6146). The IPv6 client embeds the IPv4 address it wishes to communicate with using these bits, and sends its packets to the resulting address. The NAT64 server then creates a NAT-mapping between the IPv6 and the IPv4 address, allowing them to communicate.
Reference: http://en.wikipedia.org/wiki/NAT64
Q59. Which statement about dual stack is true?
A. Dual stack translates IPv6 addresses to IPv4 addresses.
B. Dual stack means that devices are able to run IPv4 and IPv6 in parallel.
C. Dual stack translates IPv4 addresses to IPv6 addresses.
D. Dual stack changes the IP addresses on hosts from IPv4 to IPv6 automatically.
Answer: B
Explanation:
Q60. After you review the output of the command show ipv6 interface brief, you see that several IPv6 addresses have the 16-bit hexadecimal value of "FFFE" inserted into the address. Based on this information, what do you conclude about these IPv6 addresses?
A. IEEE EUI-64 was implemented when assigning IPv6 addresses on the device.
B. The addresses were misconfigured and will not function as intended.
C. IPv6 addresses containing "FFFE" indicate that the address is reserved for multicast.
D. The IPv6 universal/local flag (bit 7) was flipped.
E. IPv6 unicast forwarding was enabled, but IPv6 Cisco Express Forwarding was disabled.
Answer: A
Explanation:
Extended Unique Identifier (EUI), as per RFC2373, allows a host to assign iteslf a unique 64-
Bit IP Version 6 interface identifier (EUI-64). This feature is a key benefit over IPv4 as it eliminates the
need of manual configuration or DHCP as in the world of IPv4. The IPv6 EUI-64 format address is obtained
through the 48-bit MAC address. The Mac address is first separated into two 24-bits, with one being OUI
(Organizationally Unique Identifier) and the other being NIC specific. The 16-bit 0xFFFE is then inserted
between these two 24-bits to for the 64-bit EUI address. IEEE has chosen FFFE as a reserved value which
can only appear in EUI-64 generated from the an EUI-48 MAC address. Here is an example showing how
a the Mac Address is used to generate EUI.
Next, the seventh bit from the left, or the universal/local (U/L) bit, needs to be inverted. This bit identifies whether this interface identifier is universally or locally administered. If 0, the address is locally
administered and if 1, the address is globally unique. It is worth noticing that in the OUI portion, the globally
unique addresses assigned by the IEEE has always been set to 0 whereas the locally created addresses
has 1 configured. Therefore, when the bit is inverted, it maintains its original scope (global unique address
is still global unique and vice versa). The reason for inverting can be found in RFC4291 section 2.5.1.
Once the above is done, we have a fully functional EUI-64 format address.
Reference: https://
supportforums.cisco.com/document/100566/understanding-ipv6-eui-64-bit- address
