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Q51. Which statement about the use of tunneling to migrate to IPv6 is true?
A. Tunneling is less secure than dual stack or translation.
B. Tunneling is more difficult to configure than dual stack or translation.
C. Tunneling does not enable users of the new protocol to communicate with users of the old protocol without dual-stack hosts.
D. Tunneling destinations are manually determined by the IPv4 address in the low-order 32 bits of IPv4-compatible IPv6 addresses.
Using the tunneling option, organizations build an overlay network that tunnels one protocol over the other
by encapsulating IPv6 packets within IPv4 packets and IPv4 packets within IPv6 packets. The advantage of this approach is that the new protocol can work without disturbing the old protocol, thus providing connectivity between users of the new protocol. Tunneling has two disadvantages, as discussed in RFC 6144: Users of the new architecture cannot use the services of the underlying infrastructure.
Tunneling does not enable users of the new protocol to communicate with users of the old protocol without
dual-stack hosts, which negates interoperability.
Q52. Which PPP authentication method sends authentication information in cleartext?
A. MS CHAP
Q53. Refer to the exhibit. After configuring GRE between two routers running OSPF that are connected to each other via a WAN link, a network engineer notices that the two routers cannot establish the GRE tunnel to begin the exchange of routing updates. What is the reason for this?
A. Either a firewall between the two routers or an ACL on the router is blocking IP protocol number 47.
B. Either a firewall between the two routers or an ACL on the router is blocking UDP 57.
C. Either a firewall between the two routers or an ACL on the router is blocking TCP 47.
D. Either a firewall between the two routers or an ACL on the router is blocking IP protocol number 57.
Q54. Which statement is true about the PPP Session Phase of PPPoE?
A. PPP options are negotiated and authentication is not performed. Once the link setup is completed, PPPoE functions as a Layer 3 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers.
B. PPP options are not negotiated and authentication is performed. Once the link setup is completed, PPPoE functions as a Layer 4 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers.
C. PPP options are automatically enabled and authorization is performed. Once the link setup is completed, PPPoE functions as a Layer 2 encapsulation method that allows data to be encrypted over the PPP link within PPPoE headers.
D. PPP options are negotiated and authentication is performed. Once the link setup is completed, PPPoE functions as a Layer 2 encapsulation method that allows data to be transferred over the PPP link within PPPoE headers.
PPPoE is composed of two main phases:
Active Discovery Phase--In this phase, the PPPoE client locates a PPPoE server, called an access concentrator. During this phase, a Session ID is assigned and the PPPoE layer is established.
PPP Session Phase--In this phase, PPP options are negotiated and authentication is performed. Once the
link setup is completed, PPPoE functions as a Layer 2 encapsulation method, allowing data to be transferred over the PPP link within PPPoE headers.
Q55. What is the result of the command ip flow-export destination 10.10.10.1 5858?
A. It configures the router to export cache flow information to IP 10.10.10.1 on port UDP/5858.
B. It configures the router to export cache flow information about flows with destination IP 10.10.10.1 and port UDP/5858.
C. It configures the router to receive cache flow information from IP 10.10.10.1 on port UDP/5858.
D. It configures the router to receive cache flow information about flows with destination IP 10.10.10.1 and port UDP/5858.
To enable the exporting of information in NetFlow cache entries, use the ip flow-export destination
command in global configuration mode.
ip- IP address of the workstation to which you want to send the address NetFlow information.
udp-port UDP protocol-specific port number.
Q56. 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.
Q57. Which IPv6 address type is seen as the next-hop address in the output of the show ipv6 rip RIPng database command?
Q58. Which parameter in an SNMPv3 configuration offers authentication and encryption?
Q59. Refer to the exhibit.
Which statement is true?
A. Traffic from the 172.16.0.0/16 network will be blocked by the ACL.
B. The 10.0.0.0/8 network will not be advertised by Router B because the network statement for the 10.0.0.0/8 network is missing from Router B.
C. The 10.0.0.0/8 network will not be in the routing table on Router B.
D. Users on the 10.0.0.0/8 network can successfully ping users on the 192.168.5.0/24 network, but users on the 192.168.5.0/24 cannot successfully ping users on the 10.0.0.0/8 network.
E. Router B will not advertise the 10.0.0.0/8 network because it is blocked by the ACL.
Q60. An organization decides to implement NetFlow on its network to monitor the fluctuation of traffic that is disrupting core services. After reviewing the output of NetFlow, the network engineer is unable to see OUT traffic on the interfaces. What can you determine based on this information?
A. Cisco Express Forwarding has not been configured globally.
B. NetFlow output has been filtered by default.
C. Flow Export version 9 is in use.
D. The command ip flow-capture fragment-offset has been enabled.
We came across a recent issue where a user setup a router for NetFlow export but was unable to see the
OUT traffic for the interfaces in NetFlow Analyzer. Every NetFlow configuration aspect was checked and
nothing incorrect was found. That is when we noticed the `no ip cef' command on the router. CEF was
enabled at the global level and within seconds, NetFlow Analyzer started showing OUT traffic for the
interfaces. This is why this topic is about Cisco Express Forwarding.
What is switching?
A Router must make decisions about where to forward the packets passing through. This decision-making
process is called "switching". Switching is what a router does when it makes the following decisions:
1.Whether to forward or not forward the packets after checking that the destination for the packet is
2.If the destination is reachable, what is the next hop of the router and which interface will the router use to
get to that destination.
What is CEF?
CEF is one of the available switching options for Cisco routers. Based on the routing table, CEF creates its
own table, called the Forwarding Information Base (FIB). The FIB is organized differently than the routing
table and CEF uses the FIB to decide which interface to send traffic from. CEF offers the following
1.Better performance than fast-switching (the default) and takes less CPU to perform the same task.
2.When enabled, allows for advanced features like NBAR
3.Overall, CEF can switch traffic faster than route-caching using fast-switching
How to enable CEF?
CEF is disabled by default on all routers except the 7xxx series routers. Enabling and Disabling CEF is
easy. To enable CEF, go into global configuration mode and
enter the CEF command.
Router# config t
Router(config)# ip cef
To disable CEF, simply use the `no' form of the command, ie. `no ip cef`.
Why CEF Needed when enabling NetFlow ?
CEF is a prerequisite to enable NetFlow on the router interfaces. CEF decides through which interface
traffic is exiting the router. Any NetFlow analyzer product will calculate the OUT traffic for an interface
based on the Destination Interface value present in the NetFlow packets exported from the router. If the
CEF is disabled on the router, the NetFlow packets exported from the router will have "Destination
interface" as "null" and this leads NetFlow Analyzer to show no OUT traffic for the interfaces. Without
enabling the CEF on the router, the NetFlow packets did not mark the destination interfaces and so
NetFlow Analyzer was not able to show the OUT traffic for the interfaces. Reference: https://