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Q101. What is a disadvantage of using aggressive mode instead of main mode for ISAKMP/IPsec establishment?
A. It does not use Diffie-Hellman for secret exchange.
B. It does not support dead peer detection.
C. It does not support NAT traversal.
D. It does not hide the identity of the peer.
Answer: D
Explanation:
IKE phase 1's purpose is to establish a secure authenticated communication channel by using the Diffie–Hellman key exchange algorithm to generate a shared secret key to encrypt further IKE communications. This negotiation results in one single bi-directional ISAKMP Security Association (SA). The authentication can be performed using either pre-shared key (shared secret), signatures, or public key encryption.Phase 1 operates in either Main Mode or Aggressive Mode. Main Mode protects the identity of the peers; Aggressive Mode does not.
Reference: http://en.wikipedia.org/wiki/Internet_Key_Exchange
Q102. Refer to the exhibit.
All routers are running EIGRP and the network has converged. R3 and R4 are configured as EIGRP Stub. If the link between R1 and R3 goes down, which statement is true?
A. R1 sends traffic destined to 192.168.0.100 via R2.
B. R2 does not have a route to 192.168.0.0/24 in the routing table.
C. The prefix 192.168.0.0/24 becomes stuck-in-active on R4.
D. R3 does not advertise 192.168.0.0/24 to R4 anymore.
Answer: B
Q103. DRAG DROP
Drag and drop the argument of the mls ip cef load-sharing command on the left to the function it performs on the right.
Answer:
Q104. Which option is an incorrect design consideration when deploying OSPF areas?
A. area 1 - area 0 - MPLS VPN backbone - area 0 - area 2
B. area 1 - MPLS VPN backbone - area 2
C. area 1 - MPLS VPN backbone - area 1
D. area 2 - area 0 - MPLS VPN backbone - area 1
E. area 0 - area 2 - MPLS VPN superbackbone - area 1
Answer: E
Explanation:
In the case of MPLS-VPN Backbone as The OSPF superbackbone behaves exactly like Area 0 in regular OSPF, so we cannot have two different area 0’s that are not directly connected to each other. When area 0 connects to the superbackbone, it simply becomes an extension of area 0.
Q105. DRAG DROP
Drag and drop the DSCP PHB on the left to the corresponding binary representation on the right.
Answer:
Q106. Which two statements are characteristics of Ethernet private LAN circuits? (Choose two.)
A. They support communication between two or more customer endpoints.
B. They utilize more than one bridge domain.
C. They support point-to-multipoint EVC.
D. They support multipoint-to-multipoint EVC.
Answer: A,D
Explanation:
An Ethernet Private LAN (EPLAN) is a multipoint–to–multipoint EVC. EPLAN is an EVC that supports communication between two or more UNIs. In EPLAN, only one EVC can exist on a port and the port can have only one EFP.
Reference: https://www.cisco.com/c/en/us/td/docs/optical/cpt/r9_3/configuration/guide/cpt93_configurat ion/cpt93_configuration_chapter_0100.pdf
Q107. Which two routing protocols are not directly supported by Cisco PfR route control, and rely on the Cisco PfR subfeature PIRO? (Choose two.)
A. BGP
B. EIGRP
C. Static routing
D. OSPF
E. IS-IS
Answer: D,E
Explanation:
Protocol Independent Route Optimization (PIRO) introduced the ability of Performance Routing (PfR) to search for a parent route—an exact matching route, or a less specific route—in the IP Routing Information Base (RIB), allowing PfR to be deployed in any IP-routed environment including Interior Gateway Protocols (IGPs) such as OSPF and IS-IS.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-piro.html
Q108. Which configuration sets a minimum quality of service on a Layer 2 access switch?
A. mls qos cos override
mls qos cos 2
B. mls qos cos 2
C. mls qos trust cos
mls qos cos 2
D. mls qos trust cos
E. mls qos trust dscp
Answer: A
Explanation:
The mls qos cos override interface command must be used to ensure that untrusted CoS values are explicitly set 0 (default).
Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/Qo S-SRND-Book/QoSDesign.html
Q109. Which protocol is the encapsulating protocol for mtrace packets?
A. ICMP
B. IGMP
C. PIM
D. GRE
Answer: B
Explanation:
“mtrace” is a diagnostic tool to trace the multicast path from a specified source to a destination for a multicast group. It runs over IGMP protocol. Mtrace uses any information available to it to determine a previous hop to forward the trace towards the source.
Reference: http://www.brocade.com/downloads/documents/html_product_manuals/NI_05500c_MULTI CAST/wwhelp/wwhimpl/common/html/wwhelp.htm#context=NI_MCAST&file=IP_Multicast. 3.04.html
Q110. Refer to the exhibit.
The customer wants to use IP SLA to create a failover to ISP2 when both Ethernet connections to ISP1 are down. The customer also requires that both connections to ISP1 are utilized during normal operations.
Which IP route configuration accomplishes these requirements for the customer?
A. ip route 0.0.0.0 0.0.0.0 192.168.0.1 track 1
ip route 0.0.0.0 0.0.0.0 192.168.1.1 track 2
ip route 0.0.0.0 0.0.0.0 192.168.2.1 track 3
B. ip route 0.0.0.0 0.0.0.0 192.168.0.1 track 1
ip route 0.0.0.0 0.0.0.0 192.168.1.1 track 2
ip route 0.0.0.0 0.0.0.0 192.168.2.1 track 4.100
C. ip route 0.0.0.0 0.0.0.0 192.168.0.1 track 1
ip route 0.0.0.0 0.0.0.0 192.168.1.1 track 2
ip route 0.0.0.0 0.0.0.0 192.168.2.1 track 3.100
D. ip route 0.0.0.0 0.0.0.0 192.168.0.1 track 1 1
ip route 0.0.0.0 0.0.0.0 192.168.1.1 track 2 2
ip route 0.0.0.0 0.0.0.0 192.168.2.1 track 3 3
Answer: C