Cisco Exam #640-801: CCNA (Cisco Press, set 1)
Test your basic networking knowledge for Cisco's entry-level certification exam with these 10 questions and answers.
courtesy of Cisco Press
Question:
1. You are trying to understand a problem that you have with one of your switches. The switch, a 2950, has three hosts connected to it. On port f0/1 is your server called 'Blue', on f0/2 is a host called 'Green' and on port f0/3 is your computer called 'Black'. The very first frame sent by any of the three hosts is a frame sent by Green, with Blue’s destination MAC address. Out which interfaces will the frame be sent?
a. f0/1
b. f0/3
c. f0/2
2. You organization has three buildings: Red, Blue and Green. Each building has a Cisco 2950 switch. Building Red has your VTP server and you have created 3 VLANs; Programmers, QA and Admin. Building Green does not have any Admin people. What technology will allow you to stop the Admin VLAN from sending broadcasts to building Green?
a. VTP Trunking
b. VTP Blocking
c. VTP Pruning
d. VTP Halting
e. VTP Limiting
3. Your routing table is reaching a large size. What could you do to decrease the size of your routing table?
a. Implement summarization
b. Add more memory to your routers
c. Switch to a different routing protocol
d. Replace your routers with a more powerful ones
4. What command will show details of the LAPD protocol in real-time on the router?
a. debug isdn q921
b. debug isdn lapd
c. debug isdn details
d. show isdn q921
e. show isdn lapd
f. show isdn details
5. OSPF routers can hear Hellos from another router on the same subnet, but not form a neighbor relationship. In which of the following definitely prevent neighbor relationship from being formed?
a. An “ip ospf access-group 101 in” command on the interface, with ACL 101 filtering the RID of the other router
b. Mismatched subnet numbers
c. Mismatched networks listed in the configured “network” commands
d. Mismatched Hello intervals
e. When both routers have the same configured dead interval, but with the dead interval not being four times the Hello interval
6. Which subnet is the host 200.1.1.99 /27 on?
a. 200.1.1.0
b. 200.1.1.96
c. 200.1.1.16
d. 200.1.1.128
e. 200.1.1.64
7. Which protocol will find an unknown layer 2 address from a known IP Address?
a. DNS
b. ARP
c. ICMP
d. DHCP
8. What is the first thing a bridge does when it receives a frame containing a source MAC address it has not heard before?
a. It forwards the frame out of all ports, except the one on which the frame arrived
b. It adds the source and destination MAC address to the MAC table, associated with the incoming interface
c. It adds the source MAC address to its MAC table
d. It checks the frame for loops
9. STP or Spanning Tree Protocol has many advantages, like preventing loops. Select some of the major disadvantages to STP.
a. Without tuning, may take close to a minute to converge
b. Does not actively use redundant links
c. Only works on 100baseT
d. Is Cisco proprietary
10. What is the broadcast address for the subnet that IP address 192.168.26.12 255.255.255.248 is a member of?
a. 192.168.26.15
b. 192.168.26.255
c. 192.168.26.16
d. 192.168.26.8
1. A and B are correct. When a switch receives a packet it does not know the destination to, it will send it out of all the interfaces except the one it heard the packet on.
2. C is correct. VTP Pruning prevents VLANs that are not configured on switches that do not use them from being sent to them.
3. A is correct. Summarization enables groups of IP addresses to be grouped together and represented with a single entry in the routing table.
4. A is correct. The “debug isdn q921” command will show information in real-time about the LAPD protocol.
5. B and D are correct. The other possibilities are mismatched dead intervals and mismatched area numbers. The dead intervals must match for the routers to become neighbors, and the dead interval defaults to four times the Hello interval, but the dead interval does not have to be four times the Hello interval.
6. B is correct. The shorthand notation /27 = 3 subnet bits in the last octet = decimal 255.255.255.224. Shortcut: 256 - 224 = 32. Valid subnets are multiples of 32 (32, 64, 96, 128, etc).
ARP (Address Resolution Protocol) uses broadcasts to find the MAC address associated with a known IP address.
DNS (Domain Name Service) associates names with IP addresses.
ICMP (Internet Control Message Protocol) is comprised of a series of protocols used to test connectivity.
DHCP (Dynamic Host Configuration Protocol) is used to dynamically configure IP information on hosts.
8. C is correct. The bridge will first create an entry in its MAC table for the new address, then forward the frame appropriately.
9. A and B are correct. STP is a standards based protocol that creates a topology where no loops can exist. Because it blocks ports that may cause a loop, it does not use redundant links actively.
10. A is correct. The broadcast address is the address in which the host portion of the address is all 1s. This address can be easily found by subtracting one from the next subnet address.
In this case, our mask of 255.255.255.248 tells us that subnets occur at multiples of 8. We are on the 192.168.26.8 255.255.255.248 subnet, which makes the next subnet 192.168.26.16. If you subtract 1 from 16 you get 15. The broadcast address for our subnet is 192.168.26.15.
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