Q1. Which cache aggregation scheme is supported by NetFlow ToS-based router aggregation?
A. prefix-port
B. AS
C. protocol port
D. destination prefix
Answer: A
Q2. Which three routing protocols utilize TLVs? (Choose three.)
A. BGP
B. IS-IS
C. ODR
D. OSPF
E. EIGRP
F. RIP
Answer: A,B,E
Explanation:
IS-IS, originally designed for Open System Interconnection (OSI) routing, uses TLV parameters to carry information in Link State Packets (LSPs). The TLVs make IS-IS extendable. IS-IS can therefore carry different kinds of information in the LSPs. Several routing protocols use TLVs to carry a variety of attributes. Cisco Discovery Protocol (CDP), Label Discovery Protocol (LDP), and Border Gateway Protocol (BGP) are examples of protocols that use TLVs. BGP uses TLVs to carry attributes such as Network Layer Reachability Information (NLRI), Multiple Exit Discriminator (MED), and local pReference: The IP header of the EIGRP packet specifies IP protocol number 88 within it, and the maximum length of the packet will be the IP MTU of the interface on which it is transmitted, most of the time 1500 octets. Following the IP header is the various Type/Length/Value (TLV) triplets. These TLVs will not only carry the route entries but also provide fields for the management of the DUAL process, multicast sequencing, and IOS software versions from the router.
References: http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/5739-tlvs-5739.html http://ericleahy.com/index.php/eigrp-packets-neighborships/
Q3. Which EIGRP configuration results in subsecond failover outside of the basic routing
protocol convergence?
A. bfd all-interfaces
B. timers active-time disabled
C. timers active-time 1
D. timers nsf route-hold 20
Answer: A
Q4. What is the most common use for route tagging in EIGRP?
A. to determine the route source for management purposes
B. to change the metric of a prefix
C. to filter routes in order to prevent routing loops
D. to modify path selection for certain classes of traffic
Answer: C
Q5. Which statement about Cisco Discovery Protocol is true?
A. The multicast address 0100.0cdd.dddd is used as the destination address for periodic advertisements.
B. An inactive VLAN that is configured on an access port passes periodic Cisco Discovery Protocol advertisements.
C. The multicast address 0100.0ccc.ccd is used as the destination address for periodic advertisements.
D. A VLAN must be active on an access port before periodic Cisco Discovery Protocol advertisements are passed.
Answer: D
Explanation:
All CDP packets include a VLAN ID. If you configure CDP on a Layer 2 access port, the CDP packets sent from that access port include the access port VLAN ID. If you configure CDP on a Layer 2 trunk port, the CDP packets sent from that trunk port include the lowest configured VLAN ID allowed on that trunk port. CDP messages on the active physical interfaces (Ethernet NIC) to a well-known multicast address (0100.0CCC.CCCC.
Q6. DRAG DROP
Drag and drop the method for refreshing BGP prefixes on the left to the corresponding description on the right.
Answer:
Q7. Which multicast protocol uses source trees and RPF?
A. DVMRP
B. PIM sparse mode
C. CBT
D. mOSPF
Answer: A
Explanation:
DVMRP builds a parent-child database using a constrained multicast model to build a forwarding tree rooted at the source of the multicast packets. Multicast packets are initially flooded down this source tree. If redundant paths are on the source tree, packets are not forwarded along those paths. Forwarding occurs until prune messages are received on those parent-child links, which further constrains the broadcast of multicast packets.
Reference: DVMRP and dense-mode PIM use only source trees and use RPF as previously described.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12-1_19_ea1/configuration/guide/3550scg/swmcast.html
Q8. Which option is the default point of insertion for the BGP cost community?
A. before best path calculation
B. after best path calculation
C. after the IGP metric comparison
D. after the router ID comparison
Answer: C
Q9. Refer to the exhibit.
Why is the router out of memory?
A. The router is experiencing a BGP memory leak software defect.
B. The BGP peers have been up for too long.
C. The amount of BGP update traffic in the network is too high.
D. The router has insufficient memory due to the size of the BGP database.
Answer: D
Explanation:
Here we can see that this router is running out of memory due to the large size of the BGP routing database. In this case, this router is receiving over 200,000 routes from each of the 4 peers.
Q10. DRAG DROP
Drag and drop the RIP configuration command on the left to the function it performs on the right.
Answer: