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Q1. A network administrator executes the command clear ip route. Which two tables does this command clear and rebuild? (Choose two.)
A. IP routing
B. FIB
C. ARP cache
D. MAC address table
E. Cisco Express Forwarding table
F. topology table
Answer: A,B
Explanation:
To clear one or more entries in the IP routing table, use the following commands in any mode:
Command Purpose
clear ip route {* |
Clears one or more routes from both the
{route |
unicast RIB and all the module FIBs. The
prefix/length}[next-hop route options are as follows:
interface]}
· *--All routes.
[vrf vrf-name]
Example:
· route--An individual IP route.
switch(config)# clear ip
· prefix/length--Any IP prefix.
route
10.2.2.2 · next-hop--The next-hop address · interface--The interface to reach the next-hop address.
The vrf-name can be any case-sensitive, al-phanumeric string up to 32 characters.
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/unicast/5_0_3_N1_1/Ci
sco_n5k_layer3_ucast_cfg_rel_503_N1_1/l3_manage-routes.html
Q2. 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
Q3. Which PPP authentication method sends authentication information in clear text?
A. MS CHAP
B. CDPCP
C. CHAP
D. PAP
Answer: D
Explanation:
PAP authentication involves a two-way handshake where the username and password are
sent across the link in clear text; hence, PAP authentication does not provide any protection against
playback and line sniffing. CHAP authentication, on the other hand, periodically verifies the identity of the
remote node using a three-way handshake. After the PPP link is established, the host sends a "challenge"
message to the remote node. The remote node responds with a value calculated using a one-way hash
function. The host checks the response against its own calculation of the expected hash value. If the
values match, the authentication is acknowledged; otherwise, the connection is terminated. Reference:
http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10241- ppp-callinhostname.
html
Q4. 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
Q5. Refer to the exhibit. Which statement about the command output is true?
A. The router exports flow information to 10.10.10.1 on UDP port 5127.
B. The router receives flow information from 10.10.10.2 on UDP port 5127.
C. The router exports flow information to 10.10.10.1 on TCP port 5127.
D. The router receives flow information from 10.10.10.2 on TCP port 5127.
Answer: A
Explanation:
Q6. A network engineer executes the “ipv6 flowset” command. What is the result?
A. Flow-label marking in 1280-byte or larger packets is enabled.
B. Flow-set marking in 1280-byte or larger packets is enabled.
C. IPv6 PMTU is enabled on the router.
D. IPv6 flow control is enabled on the router.
Answer: A
Explanation:
Enabling Flow-Label Marking in Packets that Originate from the Device This feature allows the device to
track destinations to which the device has sent packets that
are 1280 bytes or larger.
SUMMARY STEPS
1.enable
2.configure terminal
3.ipv6 flowset
4.exit
5.clear ipv6 mtu
DETAILED STEPS
Command or Action Purpose
Step 1 enable Enables privileged EXEC mode.
Enter your password if prompted.
Example:
Device> enable
Step 2 configure terminal Enters global configuration mode.
Example:
Device# configure
terminal
Step 3 ipv6 flowset Configures flow-label marking in 1280-byte or larger packets sent by the device.
Example:
Device# configure
terminal
Step 3 ipv6 flowset Configures flow-label marking in 1280-byte or larger packets sent by the device.
Example:
Device(config)# ipv6
flowset
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/15- mt/ip6b-15-mtbook/ip6-mtu-path-disc.html
Q7. Refer to the exhibit. The DHCP client is unable to receive a DHCP address from the DHCP server. Consider the following output:
hostname RouterB ! interface fastethernet 0/0
ip address 172.31.1.1 255.255.255.0 interface serial 0/0 ip address 10.1.1.1 255.255.255.252
! ip route 172.16.1.0 255.255.255.0 10.1.1.2
Which configuration is required on the Router B fastethernet 0/0 port in order to allow the DHCP client to successfully receive an IP address from the DHCP server?
A. RouterB(config-if)# ip helper-address 172.16.1.2
B. RouterB(config-if)# ip helper-address 172.16.1.1
C. RouterB(config-if)# ip helper-address 172.31.1.1
D. RouterB(config-if)# ip helper-address 255.255.255.255
Answer: A
Explanation:
Q8. 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:
Q9. Refer to the exhibit. The command is executed while configuring a point-to-multipoint Frame Relay interface. Which type of IPv6 address is portrayed in the exhibit?
A. link-local
B. site-local
C. global
D. multicast
Answer: A
Explanation:
Q10. Which traffic characteristic is the reason that UDP traffic that carries voice and video is assigned to the queue only on a link that is at least 768 kbps?
A. typically is not fragmented
B. typically is fragmented
C. causes windowing
D. causes excessive delays for video traffic
Answer: A
Explanation: