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Q171. Which three statements are true about unicast RPF? (Choose three.)
A. Unicast RPF requires CEF to be enabled.
B. Unicast RPF strict mode works better with multihomed networks.
C. Unicast RPF strict mode supports symmetric paths.
D. Unicast RPF strict mode supports asymmetric paths.
E. CEF is optional with Unicast RPF, but when CEF is enabled it provides better performance.
F. Unicast RPF loose mode is typically used with ISP networks.
Answer: A,C,F
Q172. Refer to the exhibit.
Which route type is displayed when you enter the command show ip route supernets-only on a device with this configuration?
A. Connected
B. OSPF
C. RIP
D. EIGRP
E. An empty route set
Answer: E
Explanation:
This command shows supernets only; it does not show subnets. In this case, the routing table would contain the 10.0.0.0/24 subnet, but not the 10.0.0.0/8 supernet.
Q173. Refer to the exhibit.
Routers R1, R2, and R3 are configured as shown, and traffic from R2 fails to reach 172.29.168.3.
Which action can you take to correct the problem?
A. Correct the static route on R1.
B. Correct the default route on R2.
C. Edit the EIGRP configuration of R3 to enable auto-summary.
D. Correct the network statement for 172.29.168.3 on R3.
Answer: A
Explanation:
On R1 we see there is a wrongly configured static route: ip route 172.29.168.3 255.255.255.255 172.17.17.2. It should be ip route 172.29.168.3 255.255.255.255 10.17.12.3.
Q174. Which statement about the BGP scope of the cost community is true?
A. It is shared with IBGP neighbors only.
B. It is shared with IBGP neighbors and route reflectors.
C. It is shared with EBGP neighbors only.
D. It is shared with IBGP and EBGP neighbors.
E. It is shared with IBGP and confederation peers.
Answer: E
Explanation:
The BGP Cost Community feature introduces the cost extended community attribute. The cost community is a non-transitive extended community attribute that is passed to internal BGP (iBGP) and confederation peers but not to external BGP (eBGP) peers. The cost community feature allows you to customize the local route preference and influence the best path selection process by assigning cost values to specific routes.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/s_bgpcc.html
Q175. What is Nagle's algorithm used for?
A. To increase the latency
B. To calculate the best path in distance vector routing protocols
C. To calculate the best path in link state routing protocols
D. To resolve issues caused by poorly implemented TCP flow control.
Answer: D
Explanation:
Silly window syndrome is a problem in computer networking caused by poorly implemented TCP flow control. A serious problem can arise in the sliding window operation when the sending application program creates data slowly, the receiving application program consumes data slowly, or both. If a server with this problem is unable to process all incoming data, it requests that its clients reduce the amount of data they send at a time (the window setting on a TCP packet). If the server continues to be unable to process all incoming data, the window becomes smaller and smaller, sometimes to the point that the data transmitted is smaller than the packet header, making data transmission extremely inefficient. The name of this problem is due to the window size shrinking to a "silly" value. When there is no synchronization between the sender and receiver regarding capacity of the flow of data or the size of the packet, the window syndrome problem is created. When the silly window syndrome is created by the sender, Nagle's algorithm is used. Nagle's solution requires that the sender sends the first segment even if it is a small one, then that it waits until an ACK is received or a maximum sized segment (MSS) is accumulated.
Reference: http://en.wikipedia.org/wiki/Silly_window_syndrome
Q176. Refer to the exhibit.
Which statement about this GETVPN configuration is true?
A. Co-operative key servers are configured.
B. Redundant peers are configured.
C. The key server uses multicast mode to propagate rekey messages.
D. PSK authentication is configured.
Answer: A
Q177. Which statement about the EIGRP RTO is true?
A. It is six times the SRTT.
B. It is the time that it normally takes for an update to be received by a peer.
C. It is the time that it normally takes to receive a reply to a query.
D. It is the average time that it takes for a reliable packet to be acknowledged.
Answer: A
Explanation:
The RTO is typically six times the SRTT, the value may vary from a minimum of 200 microseconds (ms) to a maximum of 5 seconds (s).
Reference: EIGRP for IP: Basic Operation and Configuration, Alvaro Retana, Russ White, Don Slice - 2000
Q178. 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
Q179. Which two packet types does an RTP session consist of? (Choose two.)
A. TCP
B. RTCP
C. RTP
D. ICMP
E. BOOTP
F. ARP
Answer: B,C
Explanation:
An RTP session is established for each multimedia stream. A session consists of an IP address with a pair of ports for RTP and RTCP. For example, audio and video streams use separate RTP sessions, enabling a receiver to deselect a particular stream. The ports which form a session are negotiated using other protocols such as RTSP (using SDP in the setup method) and SIP. According to the specification, an RTP port should be even and the RTCP port is the next higher odd port number.
Reference: http://en.wikipedia.org/wiki/Real-time_Transport_Protocol
Q180. Refer to the exhibit.
You are bringing a new MPLS router online and have configured only what is shown to bring LDP up. Assume that the peer has been configured in a similar manner. You verify the LDP peer state and see that there are no neighbors. What will the output of show mpls ldp discovery show?
A. Interfaces:
Ethernet0/0 (ldp): xmit
B. Interfaces:
Ethernet0/0 (ldp): xmit/recv
LDP Id: 25.25.25.2:0; IP addr: 192.168.12.2
C. Interfaces:
Ethernet0/0 (ldp): xmit/recv
LDP Id: 192.168.12.2:0; no route
D. Interfaces:
Ethernet0/0 (ldp): xmit/recv
LDP Id: 25.25.25.2:0; no route
Answer: D