Cisco Exam #640-801: CCNA (Cisco Press, set 2)
Test your basic networking knowledge for Cisco's entry-level certification exam with these 10 questions and answers.
courtesy of Cisco Press
Question:
1. From the list below, select the protocols that do not support VLSM.
a. RIP-1
b. RIP-2
c. IGRP
d. EIGRP
e. BGP
f. OSPF
2. What protocol allows Frame Relay routers to dynamically learn another router's Layer 3 addresses?
a. Reverse ARP
b. Inverse ARP
c. Auto PVC
d. DDLCI
e. PVC Configure
3. For a particular NAT implementation, a private address 192.168.1.1 should always be translated with a 1:1 mapping to IP address 12.150.146.100. Which command accomplishes this?
a. ip nat inside source 192.168.1.1 12.150.146.100
b. ip nat outside source 192.168.1.1 12.150.146.100
c. ip nat inside source int s0 overload
d. ip nat inside source list 1 pool outside
4. Imagine that a Frame Relay frame is sent from R1 to R2. The frame experiences congestion while in transit. What is the most likely action of a Frame Relay switch that notices the congestion?
a. It sets the FECN bit in the frame.
b. It sets the BECN bit in the frame.
c. It sets the DE bit, triggering R2 to set the FECN bit in the next frame it sends to R1.
d. It sets the DE bit, triggering R2 to set the BECN bit in the next frame it sends to R1.
5. What is the LLC sublayer specification for IEEE Ethernet?
a. IEEE 802.3
b. IEEE 802.2
c. IEEE 801.4
d. ANSI X3T9.5
6. Assuming that an interface on a Cisco router does not have a “bandwidth” command, what is the default OSPF cost of a fractional T1 with a capacity of 1Mbps?
a. 100
b. 64
c. 19
d. 10
···> read answer
7. You have two switches in your organization with users connected to both of them. You have two segments connecting the two switches. How could you utilize and minimize the downtime so the two switches can utilize the maximum bandwidth?
a. Use EtherChannel
b. Enable multiple links
c. You can only increase the bandwidth of the individual links
d. Disable STP
8. When using static routes, you type in "ip route 10.1.1.0 255.255.255.0", two options are available to specify the next hop. Select the two valid choices.
a. s1
b. 10.2.2.2
c. via 10.2.2.2
d. pass-to 10.2.2.2
e. via s1
9. When originally designed, a branch office needed only six IP addresses, and a subnet mask of 255.255.255.248 was used. Two more devices need IP addresses on that LAN. Thankfully VLSM was properly and carefully implemented and there are several more subnets available to accommodate this new growth. Which of the following answers would work for adding these two new hosts to the LAN?
a. Add a second router with an extra Ethernet port and assign a new subnet to the branch office.
b. Assign an extra subnet to the branch office by putting a secondary IP address on the router at the office.
c. Assign a new, larger subnet to the branch LAN.
d. Use NAT to overlap the address at the branch office.
10. R1, R2, R3, and R4 have their Fast Ethernet 0/0 interfaces attached to the same VLAN. A network engineer has typed a configuration for each router by using a word processor. He will later copy and paste the configuration into the router. Examine the following exhibit, which lists configuration for the four routers, as typed by the network engineer. Assuming that all four routers can ping each other’s LAN IP addresses after the configuration has been applied, which of the following statements is true regarding EIGRP behavior between these four routers? (You can assume that, if not shown in the exhibit, all other related parameters are still set to their defaults.)
!!! Configuration on R1 !!!!!!!!!!!!!!!!!!!!!
interface fastethernet 0/0
ip address 10.1.1.1 255.255.255.0
!
router eigrp 9999
network 10.0.0.0
!!! Configuration on R2 !!!!!!!!!!!!!!!!!!!!!
interface fastethernet 0/0
ip address 10.1.1.2 255.255.255.0
!
router eigrp 9999
network 10.0.0.0
!!! Configuration on R3 !!!!!!!!!!!!!!!!!!!!!
interface fastethernet 0/0
ip address 10.1.1.3 255.255.255.0
!
router eigrp 9999
network 10.1.1.0 0.0.0.255
!!! Configuration on R4 !!!!!!!!!!!!!!!!!!!!!
interface fastethernet 0/0
ip address 10.1.1.4 255.255.255.0
!
router eigrp 9999
network 10.1.1.0 255.255.255.0
a. Only R1 and R2 will exchange routing information.
b. Only R3 and R4 will exchange routing information.
c. Three of the routers will exchange routing information, but one will not.
d. All four routers will exchange routing information.
e. None of the routers will exchange routing information.
1. A and C are correct. RIP version 1 and IGRP both do not support VLSM because they do not include the subnet mask in their updates.
2. B is correct. Inverse ARP messages are sent by each router, announcing their own Layer 3 addresses.
3. A is correct. You accomplish 1:1 static mapping with the “ip nat inside source” command, with the first IP address being the inside local address, and the second being the inside global address.
4. A is correct. FECN is set when congestion occurs in the same direction that a frame is flowing; BECN is set for frames in the opposite direction.
5. B is correct. IEEE 802.3 is the MAC sublayer specification for IEEE Ethernet. IEEE 801.4 is not a real option. ANSI X3T9.5 is the MAC sublayer specification for ANSI FDDI.
6. B is correct. Although the RFC does not specify how cost is determined, Cisco defaults to a value that is inversely proportional to 100Mbps. Although the capacity of the line is 1Mbps, the router cannot detect this and assumes the default bandwidth of roughly 1.5Mbps. The fraction 100Mbps / 1.5Mbps rounds down to a value of 64.
7. A is correct. EtherChannel enables you to fully utilize links and treat multiple links as one path.
8. A and B are correct. When using the “ip route command”, you can specify an IP address as the next hop, or an interface out which to send the packet.
9. B and C are correct. Since care was taken during the design phase, it is possible to simply add a new subnet to the branch office by adding a secondary IP address to the LAN interface of the router at the branch office. Also, a larger subnet could be assigned, which may or may not be difficult, depending on whether any static IP addresses are configured.
10. C is correct. R1, R2, and R3 will become neighbors and exchange routing information. R3's “network 10.1.1.0 0.0.0.255” command uses the wildcard mask option, meaning that all interfaces beginning with an IP address of "10.1.1" will match. R4 uses a mask like a subnet mask; however, the mask in the EIGRP network command acts like an ACL wildcard mask. In this case, R4 would match all interfaces whose IP address ends in 0.
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