Q1. CORRECT TEXT - (Topic 7)
CCNA.com has a small network that is using EIGRP as its IGP. All routers should be running an EIGRP AS number of 12. Router MGT is also running static routing to the ISP.
CCNA.com has recently added the ENG router. Currently, the ENG router does not have connectivity to the ISP router. All over interconnectivity and Internet access for the existing locations of the company are working properly.
The task is to identify the fault(s) and correct the router configuration(s) to provide full connectivity between the routers.
Access to the router CLI can be gained by clicking on the appropriate host.
All passwords on all routers are cisco.
IP addresses are listed in the chart below.
MGT
Fa0/0 – 192.168.77.33
S1/0 – 198.0.18.6
S0/0 – 192.168.27.9
S0/1 – 192.168.50.21
ENG
Fa0/0 – 192.168.77.34
Fa1/0 – 192.168.12.17
Fa0/1 – 192.168.12.1
Parts1
Fa0/0 – 192.168.12.33
Fa0/1 – 192.168.12.49
S0/0 – 192.168.27.10
Parts2
Fa0/0 – 192.168.12.65
Fa0/1 – 192.168.12.81
S0/1 – 192.168.50.22
Answer:
On the MGT Router: Config t
Router eigrp 12
Network 192.168.77.0
Q2. - (Topic 8)
Which MAC protocol sets a random timer to reattempt communication?
A. IEEE 802.1x
B. RARP
C. CSMA/CA
D. CSMA/CD
Answer: D
Q3. - (Topic 5)
Refer to the exhibit.
Which subnet mask will place all hosts on Network B in the same subnet with the least amount of wasted addresses?
A. 255.255.255.0
B. 255.255.254.0
C. 255.255.252.0
D. 255.255.248.0
Answer: B
Explanation:
310 hosts < 512 = 29 -> We need a subnet mask of 9 bits 0 -> 1111 1111.1111 1111.1111
1110.0000 0000 -> 255.255.254.0
Q4. - (Topic 5)
Refer to the exhibit.
Which rule does the DHCP server use when there is an IP address conflict?
A. The address is removed from the pool until the conflict is resolved.
B. The address remains in the pool until the conflict is resolved.
C. Only the IP detected by Gratuitous ARP is removed from the pool.
D. Only the IP detected by Ping is removed from the pool.
E. The IP will be shown, even after the conflict is resolved.
Answer: A
Explanation:
An address conflict occurs when two hosts use the same IP address. During address assignment, DHCP checks for conflicts using ping and gratuitous ARP. If a conflict is detected, the address is removed from the pool. The address will not be assigned until the administrator resolves the conflict.
(Reference: http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html)
Q5. - (Topic 4)
It has become necessary to configure an existing serial interface to accept a second Frame Relay virtual circuit. Which of the following procedures are required to accomplish this task? (Choose three.)
A. Remove the IP address from the physical interface.
B. Encapsulate the physical interface with multipoint PPP.
C. Create the virtual interfaces with the interface command.
D. Configure each subinterface with its own IP address.
E. Disable split horizon to prevent routing loops between the subinterface networks.
F. Configure static Frame Relay map entries for each subinterface network.
Answer: A,C,D
Explanation:
For multiple PVC’s on a single interface, you must use subinterfaces, with each subinterface configured for each PVC. Each subinterface will then have its own IP address, and no IP address will be assigned to the main interface.
Q6. - (Topic 4)
What occurs on a Frame Relay network when the CIR is exceeded?
A. All TCP traffic is marked discard eligible.
B. All UDP traffic is marked discard eligible and a BECN is sent.
C. All TCP traffic is marked discard eligible and a BECN is sent.
D. All traffic exceeding the CIR is marked discard eligible.
Answer: D
Explanation:
Committed information rate (CIR): The minimum guaranteed data transfer rate agreed to by the Frame Relay switch. Frames that are sent in excess of the CIR are marked as discard eligible (DE) which means they can be dropped if the congestion occurs within the Frame Relay network.
Note: In the Frame Relay frame format, there is a bit called Discard eligible (DE) bit that is used to identify frames that are first to be dropped when the CIR is exceeded.
Q7. - (Topic 7)
An administrator is trying to ping and telnet from SwitchC to RouterC with the results shown below.
Click the console connected to RouterC and issue the appropriate commands to answer the questions.
What would be the effect of issuing the command ip access-group 115 in on the s0/0/1 interface?
A. No host could connect to RouterC through s0/0/1.
B. Telnet and ping would work but routing updates would fail.
C. FTP, FTP-DATA, echo, and www would work but telnet would fail.
D. Only traffic from the 10.4.4.0 network would pass through the interface.
Answer: A
Explanation:
First let’s see what was configured on interface S0/0/1:
Q8. - (Topic 3)
Which command is used to display the collection of OSPF link states?
A. show ip ospf link-state
B. show ip ospf lsa database
C. show ip ospf neighbors
D. show ip ospf database
Answer: D
Explanation:
The “show ip ospf database” command displays the link states. Here is an example: Here is the lsa database on R2.
R2#show ip ospf database
OSPF Router with ID (2.2.2.2) (Process ID 1) Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count 2.2.2.2 2.2.2.2 793 0x80000003 0x004F85 2
10.4.4.4 10.4.4.4 776 0x80000004 0x005643 1
111.111.111.111 111.111.111.111 755 0x80000005 0x0059CA 2
133.133.133.133 133.133.133.133 775 0x80000005 0x00B5B1 2
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.1.1.1 111.111.111.111 794 0x80000001 0x001E8B
10.2.2.3 133.133.133.133 812 0x80000001 0x004BA9
10.4.4.1 111.111.111.111 755 0x80000001 0x007F16
10.4.4.3 133.133.133.133 775 0x80000001 0x00C31F
Q9. - (Topic 7)
What are three values that must be the same within a sequence of packets for Netflow to consider them a network flow? (Choose three.)
A. source IP address
B. source MAC address
C. egress interface
D. ingress interface
E. destination IP address
F. IP next-hop
Answer: A,D,E
Explanation:
Each packet that is forwarded within a router or switch is examined for a set of IP packet attributes. These attributes are the IP packet identity or fingerprint of the packet and determine if the packet is unique or similar to other packets.
Traditionally, an IP Flow is based on a set of 5 and up to 7 IP packet attributes. IP Packet attributes used by NetFlow:
• IP source address
• IP destination address
• Source port
• Destination port
• Layer 3 protocol type
• Class of Service
• Router or switch interface
All packets with the same source/destination IP address, source/destination ports, protocol interface and class of service are grouped into a flow and then packets and bytes are tallied. This methodology of fingerprinting or determining a flow is scalable because a large amount of network information is condensed into a database of NetFlow information called the NetFlow cache.
Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios- netflow/prod_white_paper0900aecd80406232.html
Q10. - (Topic 4)
What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.)
A. They create split-horizon issues.
B. They require a unique subnet within a routing domain.
C. They emulate leased lines.
D. They are ideal for full-mesh topologies.
E. They require the use of NBMA options when using OSPF.
Answer: B,C
Explanation:
Subinterfaces are used for point to point frame relay connections, emulating virtual point to point leased lines. Each subinterface requires a unique IP address/subnet. Remember, you cannot assign multiple interfaces in a router that belong to the same IP subnet.
Topic 5, Infrastructure Services
190. - (Topic 5)
What is the alternative notation for the IPv6 address B514:82C3:0000:0000:0029:EC7A:0000:EC72?
A. B514 : 82C3 : 0029 : EC7A : EC72
B. B514 : 82C3 :: 0029 : EC7A : EC72
C. B514 : 82C3 : 0029 :: EC7A : 0000 : EC72
D. B514 : 82C3 :: 0029 : EC7A : 0 : EC72