Q1. What are two reasons to define static peers in EIGRP? (Choose two.)
A. Security requirements do not allow dynamic learning of neighbors.
B. The link between peers requires multicast packets.
C. Back-level peers require static definition for successful connection.
D. The link between peers requires unicast packets.
Answer: A,D
Explanation:
There are two ways we can create EIGRP neighbor relationship:
+ Use “network ” command. This is the more popular way to create EIGRP neighbor relationship. That router will check which interfaces whose IP addresses belong to the and turn EIGRP on that interface. EIGRP messages are sent via multicast packets.
+ Use “neighbor” commanD. The interface(s) that have this command applied no longer send or receive EIGRP multicast packets. EIGRP messages are sent via unicast. The router only accepts EIGRP packets from peers that are explicitly configured with a neighbor statement. Consequently, any messages coming from routers without a corresponding neighbor statement are discarded. This helps prevent the insertion of unauthorized routing peers -> A and D are correct.
Q2. 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
Q3. Which three values can you use to configure an ERSPAN destination session? (Choose three.)
A. VLAN ID
B. source IP address
C. destination IP address
D. ID number
E. VRF
F. session name
Answer: B,D,E
Q4. Which two statements about the BGP community attribute are true? (Choose two.)
A. Routers send the community attribute to all BGP neighbors automatically.
B. A router can change a received community attribute before advertising it to peers.
C. It is a well-known, discretionary BGP attribute.
D. It is an optional transitive BGP attribute.
E. A prefix can support only one community attribute.
Answer: B,D
Explanation:
A community is a group of prefixes that share some common property and can be configured with the BGP community attribute. The BGP Community attribute is an optional transitive attribute of variable length. The attribute consists of a set of four octet values that specify a community. The community attribute values are encoded with an Autonomous System (AS) number in the first two octets, with the remaining two octets defined by the AS. A prefix can have more than one community attribute. A BGP speaker that sees multiple community attributes in a prefix can act based on one, some or all the attributes. A router has the option to add or modify a community attribute before the router passes the attribute on to other peers.
Reference:
http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/28784-bgp-community.html
Q5. DRAG DROP
Drag and drop the OSPF network type on the left to the correct category of timers on the right.
Answer:
Q6. Refer to the exhibit.
Assume that Cisco Discovery Protocol is supported and enabled only on switches A and C.
Which information is returned when you issue the command show cdp neighbors on switch C?
A. a limited amount of information about switch B
B. neighbor details for switch A
C. neighbor details for switch B
D. neighbor details for switch C
Answer: B
Q7. DRAG DROP
Drag and Drop Cisco PFR adjacency types.
Answer:
Q8. DRAG DROP
Drag and drop the Metro Ethernet circuit on the left to the corresponding Service Type category on the right.
Answer:
Q9. Which two statements about GLBP are true? (Choose two.)
A. Packets are forwarded by multiple routers that share one virtual IP address.
B. The active router forwards packets received on one virtual IP and MAC address.
C. The standby router forwards packets when the active router fails.
D. Hosts on the network are configured with multiple gateways for load balancing.
E. Routers in a GLBP group can share multiple virtual MAC addresses.
Answer: A,E
Q10. Which circumstance can cause TCP starvation and UDP dominance to occur?
A. Too few queues are available.
B. UDP is comprised of smaller packets than TCP.
C. Retransmitted TCP packets are on the network.
D. UDP and TCP data are assigned to the same service-provider class.
Answer: D