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Q1. Which statement describes Cisco PfR link groups?
A. Link groups enable Cisco PfR Fast Reroute when NetFlow is enabled on the external interfaces of the border routers.
B. Link groups define a strict or loose hop-by-hop path pReference:
C. Link groups are required only when Cisco PfR is configured to load-balance all traffic.
D. Link groups are enabled automatically when Cisco PfR is in Fast Reroute mode.
E. Link groups set a preference for primary and fallback (backup) external exit interfaces.
Answer: E
Explanation:
The Performance Routing - Link Groups feature introduced the ability to define a group of exit links as a preferred set of links, or a fallback set of links for PfR to use when optimizing traffic classes specified in an PfR policy. PfR currently selects the best link for a traffic class based on the preferences specified in a policy and the traffic class performance—using parameters such as reachability, delay, loss, jitter or MOS—on a path out of the specified link.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-link-group.html
Q2. Which statement about WAN Ethernet Services is true?
A. Rate-limiting can be configured per EVC.
B. Point-to-point processing and encapsulation are performed on the customer network.
C. Ethernet multipoint services function as a multipoint-to-multipoint VLAN-based connection.
D. UNIs can perform service multiplexing and all-in-one bundling.
Answer: A
Explanation:
The MEF has defined a set of bandwidth profiles that can be applied at the UNI or to an EVC. A bandwidth profile is a limit on the rate at which Ethernet frames can traverse the UNI or the EVC.
Reference: http://www.ciscopress.com/articles/article.asp?p=101367&seqNum=2
Q3. Which three statements are true about an EtherChannel? (Choose three.)
A. PAGP and LACP can be configured on the same switch if the switch is not in the same EtherChannel.
B. EtherChannel ports in suspended state can receive BPDUs but cannot send them.
C. An EtherChannel forms between trunks that are using different native VLANs.
D. LACP can operate in both half duplex and full duplex, if the duplex setting is the same on both ends.
E. Ports with different spanning-tree path costs can form an EtherChannel.
Answer: A,B,E
Explanation:
Answer A. EtherChannel groups running PAgP and LACP can coexist on the same switch or on different switches in the stack. Individual EtherChannel groups can run either PAgP or LACP, but they cannot interoperate.
Answer B:
EtherChannel Member Port States
Port States
Description
bundled
The port is part of an EtherChannel and can send and receive BPDUs and data traffic.
suspended
The port is not part of an EtherChannel. The port can receive BPDUs but cannot send them. Data traffic is blocked.
standalone
The port is not bundled in an EtherChannel. The port functions as a standalone data port. The port can send and receive BPDUs and data traffic.
Answer E. Ports with different spanning-tree path costs can form an EtherChannel if they are otherwise compatibly configured. Setting different spanning-tree path costs does not, by itself, make ports incompatible for the formation of an EtherChannel.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-0_2_EX/layer2/configuration_guide/b_lay2_152ex_2960-x_cg/b_lay2_152ex_2960-x_cg_chapter_010.html
Q4. Which statement describes the BGP add-path feature?
A. It allows for installing multiple IBGP and EBGP routes in the routing table.
B. It allows a network engineer to override the selected BGP path with an additional path created in the config.
C. It allows BGP to provide backup paths to the routing table for quicker convergence.
D. It allows multiple paths for the same prefix to be advertised.
Answer: D
Explanation:
BGP routers and route reflectors (RRs) propagate only their best path over their sessions. The advertisement of a prefix replaces the previous announcement of that prefix (this behavior is known as an implicit withdraw). The implicit withdraw can achieve better scaling, but at the cost of path diversity. Path hiding can prevent efficient use of BGP multipath, prevent hitless planned maintenance, and can lead to MED oscillations and suboptimal hot-potato routing. Upon nexthop failures, path hiding also inhibits fast and local recovery because the network has to wait for BGP control plane convergence to restore traffic. The BGP Additional Paths feature provides a generic way of offering path diversity; the Best External or Best Internal features offer path diversity only in limited scenarios. The BGP Additional Paths feature provides a way for multiple paths for the same prefix to be advertised without the new paths implicitly replacing the previous paths. Thus, path diversity is achieved instead of path hiding.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/irg-additional-paths.html
Q5. Which problem can result when private AS numbers are included in advertisements that are sent to the global Internet BGP table?
A. The prefixes sent with private AS numbers are always discarded on the Internet.
B. The prefixes sent with private AS numbers are always tagged as invalid on the Internet.
C. The prefixes sent with private AS numbers lack uniqueness, which can lead to a loss of connectivity.
D. The prefixes sent with private AS numbers are sometimes tagged as invalid on the Internet.
Answer: C
Explanation:
Private AS numbers are not meant to be used for global Internet BGP routing, as they are assigned locally and can be used by any organization. They are meant to enable BGP within a enterprise or VPN, but since these numbers can be used by any organization they are not unique and could cause connectivity loss if leaked to the Internet.
Q6. Refer to the exhibit.
Which statement about the debug behavior of the device is true?
A. The device debugs all IP events for 172.16.129.4.
B. The device sends all debugging information for 172.16.129.4.
C. The device sends only NTP debugging information to 172.16.129.4.
D. The device sends debugging information every five seconds.
Answer: A
Explanation:
This is an example of a conditional debug, where there is a single condition specified of IP address 172.16.129.4. So, all IP events for that address will be output in the debug.
Q7. In the DiffServ model, which class represents the highest priority with the highest drop probability?
A. AF11
B. AF13
C. AF41
D. AF43
Answer: D
Explanation:
AF43 — Assured forwarding, high drop probability, Class 4 DSCP, and Flash-override precedence.
Table of AF Classes and Drop Priority
Drop Precedence
Class 1
Class 2
Class 3
Class 4
Low drop
AF11
DSCP 10
001010
AF21
DSCP 18
010010
AF31
DSCP 26
011010
AF41
DSCP 34
100010
Medium drop
AF12
DSCP 12
001100
AF22
DSCP 20
010100
AF32
DSCP 28
011100
AF42
DSCP 36
100100
High drop
AF13
DSCP 14
001110
AF23
DSCP 22
010110
AF33
DSCP 30
011110
AF43
DSCP 38
100110
Reference:
https://www.informit.com/library/content.aspx?b=CCIE_Practical_Studies_II&seqNum=56
Q8. For which two conditions is Cisco Express Forwarding recursion disabled by default when the BGP Prefix Independent Convergence functionality is enabled? (Choose two.)
A. next hops learned with a /24 mask
B. next hops learned with any mask shorter than /32
C. next hops learned with a /32 mask
D. next hops that are directly connected
Answer: C,D
Explanation:
Recursion is the ability to find the next longest matching path when the primary path goes down. When the BGP PIC feature is not installed, and if the next hop to a prefix fails, Cisco Express Forwarding finds the next path to reach the prefix by recursing through the FIB to find the next longest matching path to the prefix. This is useful if the next hop is multiple
hops away and there is more than one way of reaching the next hop.
However, with the BGP PIC feature, you may want to disable Cisco Express Forwarding recursion for the following reasons:
. Recursion slows down convergence when Cisco Express Forwarding searches all the FIB entries.
. BGP PIC Edge already precomputes an alternate path, thus eliminating the need for Cisco Express Forwarding recursion.
When the BGP PIC functionality is enabled, Cisco Express Forwarding recursion is disabled by default for two conditions:
. For next hops learned with a /32 network mask (host routes)
. For next hops that are directly connected
For all other cases, Cisco Express Forwarding recursion is enabled.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/irg-bgp-mp-pic.html
Q9. Which object tracking function tracks the combined states of multiple objects?
A. application
B. interface
C. stub-object
D. list
Answer: D
Q10. DRAG DROP
Drag and drop each IPv6 neighbor discovery message type on the left to the corresponding description on the right.
Answer:
Q11. What does a nonzero forwarding address indicate in a type-5 LSA?
A. It indicates that this link-state ID is eligible for ECMP.
B. It indicates that this router should have an OSPF neighbor relationship with the forwarding address before using this link-state ID.
C. It indicates that the receiving router must check that the next hop is reachable in its routing table before using this link-state ID.
D. It indicates that traffic can be directly routed to this next hop in shared segment scenarios where the external route source is directly connected.
Answer: D
Explanation:
The value of the forwarding address specified by the autonomous system boundary router (ASBR) can be either 0.0.0.0 or non-zero. The 0.0.0.0 address indicates that the originating router (the ASBR) is the next hop. The forwarding address is determined by these conditions:
. The forwarding address is set to 0.0.0.0 if the ASBR redistributes routes and OSPF is not enabled on the next hop interface for those routes.
. These conditions set the forwarding address field to a non-zero address: ASBR's next hop interface address falls under the network range specified in the router ospf command.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13682-10.html
Q12. What is the purpose of EIGRP summary leaking?
A. to allow a summary to be advertised conditionally on specific criteria
B. to allow a component of a summary to be advertised in addition to the summary
C. to allow overlapping summaries to exist on a single interface
D. to modify the metric of the summary based on which components of the summary are operational
Answer: B
Explanation:
When you do manual summarization, and still you want to advertise some specific routes to the neighbor, you can do that using leak-map. Please read more about leaking routes here.
http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1. html#wp1037685.
Q13. Which three statements about Cisco HDLC are true? (Choose three.)
A. HDLC serial encapsulation provides asynchronous framing and error detection.
B. Serial link keepalives are maintained by SLARP.
C. HDLC serial encapsulation provides synchronous framing without retransmission.
D. HDLC frame size can be reduced with MPPC compression.
E. The interface is brought down after five ignored keepalives.
F. The interface is brought down after three ignored keepalives.
Answer: B,C,F
Explanation:
Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. For each encapsulation type, a certain number of keepalives ignored by a peer triggers the serial interface to transition to the down state. For HDLC encapsulation, three ignored keepalives causes the interface to be brought down. By default, synchronous serial lines use the High-Level Data Link Control (HDLC) serial encapsulation method, which provides the synchronous framing and error detection functions of HDLC without windowing or retransmission.
Reference: http://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/ 819_SCG/6ser_conf.html#78662
Q14. Which two statements about MAC Authentication Bypass are true? (Choose two.)
A. Traffic from an endpoint is authorized to pass after MAB authenticates the MAC address of the endpoint.
B. During the learning stage, the switch examines multiple packets from the endpoint to determine the MAC address of the endpoint.
C. After the switch learns the MAC address of the endpoint, it uses TACACS+ to authenticate it.
D. After learning a source MAC address, it sends the host a RADIUS Account-Request message to validate the address.
E. The MAC address of a device serves as its user name and password to authenticate with a RADIUS server.
Answer: A,E
Q15. Refer to the exhibit.
This network is configured with PIM, and the RPF check has failed toward the multicast source. Which two configuration changes must you make to router R3 to enable the RPF check to pass? (Choose two.)
A. Configure a static multicast route to the multicast source through the tunnel interface.
B. Configure a static multicast route to the multicast source LAN through the tunnel interface.
C. Configure a static multicast route to the multicast source LAN through the Ethernet interface.
D. Remove the command ip prim bidir-enable from the R3 configuration.
Answer: A,B