tch
SWITCHING
Ans -- b. Destination MAC address
Q. 2 What does a switch do if a MAC address cannot be found in the CAM table?
OSPF
Question Bank Highlight Answers for correct answer
See the figure
R1 OSPF Router ID 12.0.0.1
R2 OSPF Router ID 23.0.0.2
R3 OSPF Router ID 34.0.0.1
R4 OSPF Router ID 34.0.0.2
Q1 Virtual link command for Area 2
A R2 area 2 virtual-link 23.0.0.2
R3 area 2 virtual-link 23.0.0.1
B R2 area 1 virtual-link 34.0.0.1
R3 area 1 virtual-link 23.0.0.2
C R2 area 2 virtul-link 34.0.0.1
R3 area 2 virtual-link 12.0.0.2
D R2 area 0 virtual-link 34.0.0.1
R3 area 0 virtual-link 23.0.0.2
Q- What is area border router for Area 2.
R1
R2
R3
R4
Ans R2
Q R5 has areas in OSPF database.
Area 3 , Area 4 and Area 0
Area 3, Area 0
Area 4, Area 0
Area 0
Ans Area 3 , Area 4 and Area 0
Q Choose the right config for Virtual-link
A :-
R2
area 1 authentication
area 1 virtual-link 34.0.0.1 authentication-key cisco
R3
area 1 authentication
area 1 virtual-link 23.0.0.2 authentication-key cisco
B:-
R2
area 0 authentication
area 1 virtual-link 34.0.0.1 authentication-key cisco
R3
area 0 authentication
area 1 virtual-link 23.0.0.2 authentication-key cisco
C:-
R2
area 1 virtual-link 34.0.0.1 authentication-key cisco
R3
area 1 virtual-link 23.0.0.2 authentication-key cisco
What is a neighbor on a local LAN segment in OSPF?
1. A neighbor is a router in the same area.
2. A neighbor is a router in the same classful network.
3. A neighbor is a router on a multiaccess link, with an adjacency with a DR.
4. A neighbor is another router with the same network address.
What is an adjacency in OSPF?
1. An adjacency is when another router has received an LSA from another area. The areas are adjacent.
2. An adjacency is the state that two neighbors can achieve after they have synchronized their OSPF databases.
3. An adjacent router is one that has received a hello packet from a neighbor.
4. Routers connected across a WAN but not directly connected; for example Frame Relay, are considered adjacent to each other.
What is a designated router?
1. The router responsible for maintaining the SPF tree for a totally stubby area
2. The router responsible for summarizing routes to other areas
3. A router responsible for making adjacencies with all routers on a multiaccess link and maintaining those adjacencies
4. The router responsible for forwarding all the traffic across the global Internet
By default, how often does OSPF send out hello packets on a broadcast multiaccess link?
1. By default, OSPF sends out hello packets every 30 seconds on a broadcast network.
2. By default, OSPF sends out hello packets every 40 seconds on a broadcast network.
3. By default, OSPF sends out hello packets every 3.3 seconds on a broadcast network.
4. By default, OSPF sends out hello packets every 10 seconds on a broadcast network.
When a router sends an LSA on a multiaccess link, to what is it sent?
1. The DR, which updates the BDR every hello interval.
2. The DR and the BDR.
3. All routers on the link; all routers maintain adjacencies, but only the DR updates the rest of the network.
4. The DR, which updates the BDR every 3.3 minutes.
What does it mean when an interface shows that it is in the init state?
1. That an interface is coming online, determining the IP address and OSPF parameters
2. That a router sees a hello packet from a neighbor but the packet does not contain its own router ID
3. That this is a point-to-multipoint interface and is waiting to connect to the WAN cloud
4. Seen only on broadcast links, it shows that the election of the DR is in progress
If the network is stable and sees no changes, how often will it send LSAs? Why are these updates sent out periodically?
1. Every 30 minutes by default. This is to ensure the integrity of the topological databases.
2. Every 30 seconds by default. This is to ensure that the network is fully connected.
3. Never; there is no need if the network is stable.
4. Whenever an LSA is received; this means there is a problem on the network that needs to be flooded through the network.
In learning a new route, what will an internal OSPF router do if a received LSA is not found in the topological database?
1. The LSA is flooded immediately out of all the OSPF interfaces, except the interface from which the LSA was received.
2. The LSA is dropped and a message is sent to the transmitting router.
3. The LSA is placed in the topological database and an acknowledgement is sent to the transmitting router.
4. The sequence numbers are checked, and if the LSA is valid it is entered into the topology database.
What would the default cost of a 1-Mbps link be?
1. 1
2. 10
3. 100
4. 1000
If a router has an OSPF priority set to 0, what does this indicate?
1. A router with the OSPF priority set to 0 is one that can participate in the election of a DR. It has the highest priority.
2. A router with the OSPF priority set to 0 is one that will switch OSPF packets before it does anything else.
3. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR. It can become neither a DR nor a BDR.
4. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR, but it can become a BDR.
Which of the following IP addresses are subsumed by this command:
Router(config-router)#network 10.1.32.0 0.0.31.255 area 0
1. 10.1.32.255
2. 10.1.34.0
3. 10.1.64.0
4. 10.1.64.255
What is the default OSPF cost for a T1 link?
1. 1
2. 10
3. 32
4. 64
On a LAN segment, what is the maximum number of neighbors that can be designated as DROTHER in the show ip ospf neighbor output?
1. 1
2. 8
3. 32
4. None of these options is correct
Highlight Answers for correct answer
SWITCHING
Q 1. What information is used to
forward frames in a Layer 2 switch?
a. Source MAC address
b. Destination MAC address
c. Source switch port
d. IP addresses
b. Destination MAC address
c. Source switch port
d. IP addresses
Ans -- b. Destination MAC address
Q. 2 What does a switch do if a MAC address cannot be found in the CAM table?
a. The frame is forwarded to the
default port.
b. The switch generates an ARP request for the address.
c. The switch floods the frame out all ports (except the receiving port).
d. The switch drops the frame.
b. The switch generates an ARP request for the address.
c. The switch floods the frame out all ports (except the receiving port).
d. The switch drops the frame.
Ans c. The switch
floods the frame out all ports (except the receiving port).
Q 3. In the Catalyst 6500, frames
can be filtered with access lists for security and QoS
purposes. This filtering occurs according to which of the following?
purposes. This filtering occurs according to which of the following?
a. Before a CAM table lookup
b. After a CAM table lookup
c. Simultaneously with a CAM table lookup
d. According to how the access lists are configured
b. After a CAM table lookup
c. Simultaneously with a CAM table lookup
d. According to how the access lists are configured
ANS - Simultaneously
with a CAM table look up
Q 4.Which of the following devices performs transparent bridging?
a. Ethernet hub
b. Layer 2 switch
c. Layer 3 switch
d. Router
ANS Layer 2 switch
Q 5 Access list contents can be merged into which of the following?
a. CAM table
b. TCAM table
c. FIB table
d. ARP table
Ans TCAM table
Q 6 Multilayer switches using CEF are based on which of these
techniques?
a. Route caching
b. Netflow switching
c. Topology-based switching
d. Demand-based switching
Ans - Topology-based
switching
c. Layer 3
d. Layer 4
c. Layer 3
d. Layer 4
c. Quality of service mode
d. Error threshold
c. Link media type
d. MAC address
At what layer are traditional 10-Mbps Ethernet, Fast Ethernet, and Gigabit Ethernet
the same?
a. Layer 1
b. Layer 2c. Layer 3
d. Layer 4
At what layer are traditional 10-Mbps Ethernet, Fast Ethernet, and Gigabit Ethernet
different?
a. Layer 1
b. Layer 2c. Layer 3
d. Layer 4
Ethernet autonegotiation determines which of the following?
a. Spanning-tree mode
b. Duplex modec. Quality of service mode
d. Error threshold
Which of the following cannot be automatically determined and set if the far end of
a connection doesn’t support autonegotiation?
a. Link speed
b. Link duplex modec. Link media type
d. MAC address
OSPF
Question Bank Highlight Answers for correct answer
See the figure
R2 OSPF Router ID 23.0.0.2
R3 OSPF Router ID 34.0.0.1
R4 OSPF Router ID 34.0.0.2
Q1 Virtual link command for Area 2
A R2 area 2 virtual-link 23.0.0.2
R3 area 2 virtual-link 23.0.0.1
B R2 area 1 virtual-link 34.0.0.1
R3 area 1 virtual-link 23.0.0.2
C R2 area 2 virtul-link 34.0.0.1
R3 area 2 virtual-link 12.0.0.2
D R2 area 0 virtual-link 34.0.0.1
R3 area 0 virtual-link 23.0.0.2
Ans:- B
Q- What is area border router for Area 2.
R1
R2
R3
R4
Ans R2
Q R5 has areas in OSPF database.
Area 3 , Area 4 and Area 0
Area 3, Area 0
Area 4, Area 0
Area 0
Ans Area 3 , Area 4 and Area 0
Q Choose the right config for Virtual-link
A :-
R2
area 1 authentication
area 1 virtual-link 34.0.0.1 authentication-key cisco
R3
area 1 authentication
area 1 virtual-link 23.0.0.2 authentication-key cisco
B:-
R2
area 0 authentication
area 1 virtual-link 34.0.0.1 authentication-key cisco
R3
area 0 authentication
area 1 virtual-link 23.0.0.2 authentication-key cisco
C:-
R2
area 1 virtual-link 34.0.0.1 authentication-key cisco
R3
area 1 virtual-link 23.0.0.2 authentication-key cisco
Ans B
What is a neighbor on a local LAN segment in OSPF?
1. A neighbor is a router in the same area.
2. A neighbor is a router in the same classful network.
3. A neighbor is a router on a multiaccess link, with an adjacency with a DR.
4. A neighbor is another router with the same network address.
What is an adjacency in OSPF?
1. An adjacency is when another router has received an LSA from another area. The areas are adjacent.
2. An adjacency is the state that two neighbors can achieve after they have synchronized their OSPF databases.
3. An adjacent router is one that has received a hello packet from a neighbor.
4. Routers connected across a WAN but not directly connected; for example Frame Relay, are considered adjacent to each other.
What is a designated router?
1. The router responsible for maintaining the SPF tree for a totally stubby area
2. The router responsible for summarizing routes to other areas
3. A router responsible for making adjacencies with all routers on a multiaccess link and maintaining those adjacencies
4. The router responsible for forwarding all the traffic across the global Internet
By default, how often does OSPF send out hello packets on a broadcast multiaccess link?
1. By default, OSPF sends out hello packets every 30 seconds on a broadcast network.
2. By default, OSPF sends out hello packets every 40 seconds on a broadcast network.
3. By default, OSPF sends out hello packets every 3.3 seconds on a broadcast network.
4. By default, OSPF sends out hello packets every 10 seconds on a broadcast network.
When a router sends an LSA on a multiaccess link, to what is it sent?
1. The DR, which updates the BDR every hello interval.
2. The DR and the BDR.
3. All routers on the link; all routers maintain adjacencies, but only the DR updates the rest of the network.
4. The DR, which updates the BDR every 3.3 minutes.
What does it mean when an interface shows that it is in the init state?
1. That an interface is coming online, determining the IP address and OSPF parameters
2. That a router sees a hello packet from a neighbor but the packet does not contain its own router ID
3. That this is a point-to-multipoint interface and is waiting to connect to the WAN cloud
4. Seen only on broadcast links, it shows that the election of the DR is in progress
If the network is stable and sees no changes, how often will it send LSAs? Why are these updates sent out periodically?
1. Every 30 minutes by default. This is to ensure the integrity of the topological databases.
2. Every 30 seconds by default. This is to ensure that the network is fully connected.
3. Never; there is no need if the network is stable.
4. Whenever an LSA is received; this means there is a problem on the network that needs to be flooded through the network.
In learning a new route, what will an internal OSPF router do if a received LSA is not found in the topological database?
1. The LSA is flooded immediately out of all the OSPF interfaces, except the interface from which the LSA was received.
2. The LSA is dropped and a message is sent to the transmitting router.
3. The LSA is placed in the topological database and an acknowledgement is sent to the transmitting router.
4. The sequence numbers are checked, and if the LSA is valid it is entered into the topology database.
What would the default cost of a 1-Mbps link be?
1. 1
2. 10
3. 100
4. 1000
If a router has an OSPF priority set to 0, what does this indicate?
1. A router with the OSPF priority set to 0 is one that can participate in the election of a DR. It has the highest priority.
2. A router with the OSPF priority set to 0 is one that will switch OSPF packets before it does anything else.
3. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR. It can become neither a DR nor a BDR.
4. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR, but it can become a BDR.
Which of the following IP addresses are subsumed by this command:
Router(config-router)#network 10.1.32.0 0.0.31.255 area 0
1. 10.1.32.255
2. 10.1.34.0
3. 10.1.64.0
4. 10.1.64.255
What is the default OSPF cost for a T1 link?
1. 1
2. 10
3. 32
4. 64
On a LAN segment, what is the maximum number of neighbors that can be designated as DROTHER in the show ip ospf neighbor output?
1. 1
2. 8
3. 32
4. None of these options is correct
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