Exam Number/Code: 642-901
Exam Name: Building Scalable Cisco Internetworks
Questions and Answers: 167 Q&As
1. Which three IP multicast address related statements are true? (Choose three.)
A. Multicast addresses 224.0.0.0 through 224.0.0.255 are always forwarded because they are transmitted with Time to Live (TTL) greater than 1.
B. Multicast addresses 224.0.0.5 and 224.0.0.6 are source multicast addresses for OSPF routers.
C. Multicast addresses 224.0.0.13 and 224.0.0.22 are reserved link-local addresses used by PIMv2 and IGMPv3.
D. Because they would map to overlapping IP multicast MAC addresses, multicast addresses 224.0.1.1 and 238.1.1.1 could not be used together.
E. Multicast address 224.0.1.1 has been reserved for the Network Time Protocol (NTP) by the IANA.
F. The administratively scoped multicast addresses 239.0.0.0 through 239.255.255.255 are similar in purpose to RFC 1918 private unicast addresses.
Answer: CEF
2. What are two rules for compacting IPv6 addresses? (Choose two.)
A. The maximum number of times a double colon can replace a 16-bit segment that consists of all zeroes is two.
B. The leading zeroes in any 16-bit segment do not have to be written.
C. Every 16-bit segment that consists of all zeroes can be represented with a single colon.
D. The trailing zeroes in any 16-bit segment do not have to be written.
E. Any single, continuous string of one or more 16-bit segments that consists of all zeroes can be represented with a double colon.
F. Two zeroes in the middle of any 16-bit segment do not have to be written.
Answer: BE
3. Which three IP multicast group concepts are true? (Choose three.)
A. If a packet is sent to a multicast group address, all members of the multicast group will receive it.
B. If a packet is sent to a multicast group address, the multicast frame contains the source multicast address.
C. A router does not have to be a member of a multicast group to receive multicast data.
D. A router does not have to be a member of a multicast group to send to the group.
E. A router must be a member of a multicast group to receive multicast data.
F. A router must be a member of a multicast group to send to the group.
Answer: ADE
4. Refer to the exhibit. Router R1 is being used as a relay device for autoconfiguration of switch S1. Which configuration will accomplish this?
A. S1(config)# interface fastethernet 0/1
S1(config-if)# ip helper-address 10.0.0.2
B. S1(config)# interface fastethernet 0/1
S1(config-if)# ip helper-address 20.0.0.1
C. R1(config)# interface fastethernet 0/0
R1(config-if)# ip helper-address 20.0.0.2
R1(config-if)# ip helper-address 20.0.0.3
R1(config-if)# ip helper-address 20.0.0.4
R1(config-if)# exit
R1(config)# interface fastethernet 0/1
R1(config-if)# ip helper-address 10.0.0.1
D. R1(config)# interface fastethernet 0/0
R1(config-if)# ip helper-address 20.0.0.1
R2(config)# interface fastethernet 0/0
R2(config-if)# ip helper-address 20.0.0.1
R3(config)# interface fastethernet 0/0
R3(config-if)# ip helper-address 20.0.0.1
R4(config)# interface fastethernet 0/0
R4(config-if)# ip helper-address 20.0.0.1
E. S1(config)# interface fastethernet 0/1
S1(config-if)# ip helper-address 10.0.0.2
R2(config)# interface fastethernet 0/0
R2(config-if)# ip helper-address 20.0.0.1
R3(config)# interface fastethernet 0/0
R3(config-if)# ip helper-address 20.0.0.1
R4(config)# interface fastethernet 0/0
R4(config-if)# ip helper-address 20.0.0.1
Answer: C
5. Refer to the exhibit. Network administrators have set up a hub and spoke topology with redundant connections using EIGRP. However, they are concerned that a network outage between Router R1 and Router R2 will cause traffic from the 10.1.1.x network to the 10.1.2.x network to traverse the remote office links and overwhelm them. What command should be used to configure the spoke routers as EIGRP stub routers that will not advertise connected networks, static routes, or summary addresses?
A. eigrp stub
B. eigrp stub receive-only
C. eigrp stub connected static
D. no eigrp stub connected static
E. No additional command is needed beyond a default EIGRP configuration.
Answer: B
