Chapter 15 - IP Services (NAT and HSRP)

Question 1

Which statements correctly describe Port Address Translation (PAT)? Select 2 answers
A - PAT provides a many-to-one mapping of inside local addresses to an inside global address.
B - PAT provides a many-to-one mapping of inside global to outside global addresses.
C - Port numbers are used to map traffic arriving on the outside interface to the correct inside local address.
D - The disadvantage of PAT is that it can only be configured against an interface’s IP address (overload), which limits the number of inside global address ports available.

Question 2

Select the statements that are true regarding QoS packet classification. Select 2 answers
A - Traffic classification is required to implement the IntServ QoS model.
B - Traffic classification and marking should occur as close to the network core as possible.
C - Traffic classification and marking should occur as close to the network edge as possible.
D - Marking typically involves setting the Layer 3 packet header DSCP value or IP Precedence.

Question 3

NTP communication between network devices has which of the following characteristics? Select 2 answers
A - The communication is based on a peer-to-peer model.
B - TCP port 123 is used to provide reliable communication for NTP.
C - UDP port 123 is used for NTP communication.
D - NTP uses a distributed client/server model.

Question 4

Which of the following statements are true of all first-hop redundancy protocols (FHRPs)? Select 2 answers
A - FHRPs provide seamless failover for the default gateway used by hosts.
B - FHRPs implement an active/active model in which each router provides forwarding for the connected hosts.
C - A virtual address is used, which allows the active role to move between routers.
D - Due to the nature of the protocol, IPv6 does not require the use of FHRPs.

Question 5

Which statements correctly describe traffic shaping and traffic policing, as used in QoS policies? Select 2 answers
A - Policers can be applied to inbound or outbound directions on an interface.
B - Shapers are applied inbound on network interfaces.
C - Shapers delay and buffer excessive traffic.
D - Policing typically results in fewer TCP retransmissions compared to shaping.

Question 6

Which statements identify key benefits of using NBAR? Select 2 answers
A - NBAR allows a QoS policy to match various applications by using a deep packet inspection engine.
B - The application definitions are bundled with IOS and require an IOS upgrade to obtain the newest version of the NBAR protocol pack.
C - Layer 4 information can only be matched using extended ACLs in a QoS policy.
D - Cloud-based applications or protocols that use dynamic ports can be easily classified by NBAR.