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Q71. Refer to the following access list.
access-list 100 permit ip any any log
After applying the access list on a Cisco router, the network engineer notices that the router CPU utilization has risen to 99 percent. What is the reason for this?
A. A packet that matches access-list with the "log" keyword is Cisco Express Forwarding switched.
B. A packet that matches access-list with the "log" keyword is fast switched.
C. A packet that matches access-list with the "log" keyword is process switched.
D. A large amount of IP traffic is being permitted on the router.
Logging-enabled access control lists (ACLs) provide insight into traffic as it traverses the
network or is dropped by network devices. Unfortunately, ACL logging can be CPU intensive and can
negatively affect other functions of the network device. There are two primary factors that contribute to the
CPU load increase from ACL logging: process switching of packets that match log-enabled access control
entries (ACEs) and the generation and transmission of log messages. Reference: http://www.cisco.com/
Q72. Which three problems result from application mixing of UDP and TCP streams within a network with no QoS? (Choose three.)
E. lower throughput
It is a general best practice not to mix TCP-based traffic with UDP-based traffic (especially
streaming video) within a single service provider class due to the behaviors of these protocols during
periods of congestion. Specifically, TCP transmitters will throttle-back flows when drops have been
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 due to dropping. When TCP flows are combined with UDP flows in a single service
provider class and the class experiences congestion, then TCP flows will continually lower their rates,
potentially giving up their bandwidth to drop-oblivious UDP flows. This effect is called TCP-starvation/
UDP-dominance. This can increase latency and lower the overall throughput. TCP-starvation/UDPdominance
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, as WRED (for the most part)
only affects TCP-based flows. Granted, it is not always possible to separate TCP-based flows from UDPbased
flows, but it is beneficial to be aware of this behavior when making such application-mixing
decisions. Reference: http://www.cisco.com/warp/public/cc/so/neso/vpn/vpnsp/spqsd_wp.htm
Q73. A network engineer has left a NetFlow capture enabled over the weekend to gather information regarding excessive bandwidth utilization. The following command is entered:
switch#show flow exporter Flow_Exporter-1 What is the expected output?
A. configuration of the specified flow exporter
B. current status of the specified flow exporter
C. status and statistics of the specified flow monitor
D. configuration of the specified flow monitor
show flow exporter exporter-name (Optional) Displays the current status of the specified flow exporter.
Device# show flow exporter
Reference: http://www.cisco.com/en/US/docs/ios-xml/ios/fnetflow/configuration/15-mt/cfg-de- fnflowexprts.
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Q74. What is the primary service that is provided when you implement Cisco Easy Virtual Network?
A. It requires and enhances the use of VRF-Lite.
B. It reduces the need for common services separation.
C. It allows for traffic separation and improved network efficiency.
D. It introduces multi-VRF and label-prone network segmentation.
Q75. Refer to the exhibit. When summarizing these routes, which route is the summarized route?
A. OI 2001:DB8::/48 [110/100] via FE80::A8BB:CCFF:FE00:6F00, Ethernet0/0
B. OI 2001:DB8::/24 [110/100] via FE80::A8BB:CCFF:FE00:6F00, Ethernet0/0
C. OI 2001:DB8::/32 [110/100] via FE80::A8BB:CCFF:FE00:6F00, Ethernet0/0
D. OI 2001:DB8::/64 [110/100] via FE80::A8BB:CCFF:FE00:6F00, Ethernet0/0
Q76. Which two methods of deployment can you use when implementing NAT64? (Choose two.)
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/
Q77. Which Cisco IOS VPN technology leverages IPsec, mGRE, dynamic routing protocol, NHRP, and Cisco Express Forwarding?
D. Cisco Easy VPN
Explanation: Dynamic Multipoint Virtual Private Network (DMVPN) is a dynamic tunneling form of a virtual
private network (VPN) supported on Cisco IOS-based routers and Unix-like Operating Systems based on
the standard protocols, GRE, NHRP and IPsec. This DMVPN provides the capability for creating a
dynamic-mesh VPN network without having to pre-configure (static) all possible tunnel end-point peers,
including IPsec (Internet Protocol Security) and ISAKMP (Internet Security Association and Key
Management Protocol) peers. DMVPN is initially configured to build out a hub-and-spoke network by
statically configuring the hubs (VPN headends) on the spokes, no change in the configuration on the hub is
required to accept new spokes. Using this initial hub-and-spoke network, tunnels between spokes can be
dynamically built on demand (dynamic-mesh) without additional configuration on the hubs or spokes. This
dynamic-mesh capability alleviates the need for any load on the hub to route data between the spoke
networks. DMVPN is combination of the following technologies:
Multipoint GRE (mGRE)
Next-Hop Resolution Protocol (NHRP)
Dynamic Routing Protocol (EIGRP, RIP, OSPF, BGP)
Dynamic IPsec encryption
Cisco Express Forwarding (CEF)
Topic 5, Infrastructure Security
53. Which traffic does the following configuration allow?
ipv6 access-list cisco
permit ipv6 host 2001:DB8:0:4::32 any eq ssh
line vty 0 4
ipv6 access-class cisco in
A. all traffic to vty 0 4 from source 2001:DB8:0:4::32
B. only ssh traffic to vty 0 4 from source all
C. only ssh traffic to vty 0 4 from source 2001:DB8:0:4::32
D. all traffic to vty 0 4 from source all
Here we see that the IPv6 access list called "cisco" is being applied to incoming VTY connections to the
router. IPv6 access list has just one entry, which allows only the single IPv6 IP address of 2001:DB8:0:4::32 to connect using SSH only.