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Q21. To configure SNMPv3 implementation, a network engineer is using the AuthNoPriv security level. What effect does this action have on the SNMP messages?
A. They become unauthenticated and unencrypted.
B. They become authenticated and unencrypted.
C. They become authenticated and encrypted.
D. They become unauthenticated and encrypted.
Answer: B
Explanation:
Q22. Which two methods of deployment can you use when implementing NAT64? (Choose two.)
A. stateless
B. stateful
C. manual
D. automatic
E. static
F. functional
G. dynamic
Answer: A,B
Explanation:
While stateful and stateless NAT64 perform the task of translating IPv4 packets into IPv6 packets and vice
versa, there are important differences. The following
table provides a high-level overview of the most relevant differences.
Table 2. Differences Between Stateless NAT64 and Stateful NAT64
Stateless NAT64 Stateful NAT64
1:1 translation 1:N translation
No conservation of IPv4 address Conserves IPv4 address
Assures end-to-end address Uses address overloading, hence transparency and scalability lacks in endto-
end address transparency
No state or bindings created on the State or bindings are created on every translation unique translation
Requires IPv4-translatable IPv6 No requirement on the nature of IPv6 addresses assignment (mandatory
address assignment requirement)
Requires either manual or DHCPv6 Free to choose any mode of IPv6 based address assignment for IPv6
address assignment viz. Manual, hosts DHCPv6, SLAAC Reference: http://www.cisco.com/c/en/us/
products/collateral/ios-nx-os-software/enterprise-ipv6- solution/white_paper_c11-676277.html
Q23. Which method allows IPv4 and IPv6 to work together without requiring both to be used for a single connection during the migration process?
A. dual-stack method
B. 6to4 tunneling
C. GRE tunneling
D. NAT-PT
Answer: A
Explanation:
Dual stack means that devices are able to run IPv4 and IPv6 in parallel. It allows hosts to simultaneously
reach IPv4 and IPv6 content, so it offers a very flexible coexistence strategy. For sessions that support IPv6, IPv6 is used on a dual stack endpoint. If both
endpoints support IPv4 only, then IPv4 is used.
Benefits:
Native dual stack does not require any tunneling mechanisms on internal networks
Both IPv4 and IPv6 run independent of each other
Dual stack supports gradual migration of endpoints, networks, and applications. Reference: http://
www.cisco.com/web/strategy/docs/gov/IPV6at_a_glance_c45-625859.pdf
Q24. A router receives a routing advertisement for the same prefix and subnet from four different routing protocols. Which advertisement is installed in the routing table?
A. RIP
B. OSPF
C. iBGP
D. EIGRP
Answer: D
Explanation:
Q25. Which technology was originally developed for routers to handle fragmentation in the path between end points?
A. PMTUD
B. MSS
C. windowing
D. TCP
E. global synchronization
Answer: A
Explanation:
Q26. Refer to the exhibit.
Based on this FIB table, which statement is correct?
A. There is no default gateway.
B. The IP address of the router on FastEthernet is 209.168.201.1.
C. The gateway of last resort is 192.168.201.1.
D. The router will listen for all multicast traffic.
Answer: C
Explanation:
The 0.0.0.0/0 route is the default route and is listed as the first CEF entry. Here we see the next hop for this default route lists 192.168.201.1 as the default router (gateway of last resort).
Q27. Under which condition does UDP dominance occur?
A. when TCP traffic is in the same class as UDP
B. when UDP flows are assigned a lower priority queue
C. when WRED is enabled
D. when ACLs are in place to block TCP traffic
Answer: A
Explanation:
Explanation: Mixing TCP with UDP It is a general best practice to not mix TCP-based traffic with UDPbased
traffic (especially Streaming-Video) within a single service-provider class because of the behaviors
of these protocols during periods of congestion. Specifically, TCP transmitters throttle back flows when
drops are detected. Although some UDP applications have application-level windowing, flow control, and
retransmission capabilities, most UDP transmitters are completely oblivious to drops and, thus, never lower
transmission rates because of dropping. When TCP flows are combined with UDP flows within a single
service-provider class and the class experiences congestion, TCP flows continually lower their
transmission rates, potentially giving up their bandwidth to UDP flows that are oblivious to drops. This
effect is called TCP starvation/UDP dominance. TCP starvation/UDP dominance likely occurs if (TCP-based) Mission-Critical Data is assigned to the same service-provider class as (UDP-based) Streaming-
Video and the class experiences sustained congestion. Even if WRED is enabled on the service-provider
class, the same behavior would be observed because WRED (for the most part) manages congestion only
on TCP-based flows. Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/
WAN_and_MAN/QoS_SRND/QoS- SRND-Book/VPNQoS.html
Topic 2, Layer 2 Technologies
13. Prior to enabling PPPoE in a virtual private dialup network group, which task must be completed?
A. Disable CDP on the interface.
B. Execute the vpdn enable command.
C. Execute the no switchport command.
D. Enable QoS FIFO for PPPoE support.
Answer: B
Explanation:
Enabling PPPoE in a VPDN Group
Perform this task to enable PPPoE in a virtual private dial-up network (VPDN) group.
Restrictions
This task applies only to releases prior to Cisco IOS Release 12.2(13)T.
SUMMARY STEPS
1.enable
2.configure terminal
3.vpdn enable
4.vpdn-group name
5.request-dialin
6.protocol pppoe DETAILED STEPS Command or Action Purpose Step 1 enable Enables privileged EXEC
mode. Example: · Enter your password if Router> enable prompted. Step 2 configure terminal Enters
global configuration mode. Example: Router# configure terminal Step 3 vpdn enable Enables virtual private
dialup Example: networking. Router(config)# vpdn enable Step 4 vpdn-group name Associates a VPDN
group with a Example: customer or VPDN profile. Router(config)# vpdn-group group1 Step 5 request-dialin
Creates a request-dialin VPDN Example: subgroup. Router(config-vpdn)# request-dialin Step 6 protocol
pppoe Enables the VPDN subgroup to Example: establish PPPoE Router(config-vpdn-req-in)# pro tocol
pppoe
Reference:
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ftpppoec_support_TSD_Island
_of_Content_Chapter.html
Q28. Which address is used by the Unicast Reverse Path Forwarding protocol to validate a packet against the routing table?
A. source address
B. destination address
C. router interface
D. default gateway
Answer: A
Explanation:
The Unicast RPF feature helps to mitigate problems that are caused by the introduction of
malformed or forged (spoofed) IP source addresses into a network by discarding IP packets that lack a
verifiable IP source address. For example, a number of common types of denial-of-service (DoS) attacks,
including Smurf and Tribal Flood Network (TFN), can take advantage of forged or rapidly changing source
IP addresses to allow attackers to thwart efforts to locate or filter the attacks. For Internet service providers
(ISPs) that provide public access, Unicast RPF deflects such attacks by forwarding only packets that have
source addresses that are valid and consistent with the IP routing table. This action protects the network of
the ISP, its customer, and the rest of the Internet. Reference: http://www.cisco.com/en/US/docs/ios/12_2/
security/configuration/guide/scfrpf.html
Q29. 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:
Q30. An engineer has configured a router to use EUI-64, and was asked to document the IPv6 address of the router. The router has the following interface parameters:
mac address C601.420F.0007
subnet 2001:DB8:0:1::/64
Which IPv6 addresses should the engineer add to the documentation?
A. 2001:DB8:0:1:C601:42FF:FE0F:7
B. 2001:DB8:0:1:FFFF:C601:420F:7
C. 2001:DB8:0:1:FE80:C601:420F:7
D. 2001:DB8:0:1:C601:42FE:800F:7
Answer: A
Explanation:
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 EUI-48 MAC address. Here is an example showing how 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.
Reference: https:// supportforums.cisco.com/document/100566/understanding-ipv6-eui-64-bit- address
