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100-105 ICND1 – Cisco:

This exam tests a candidate’s knowledge and skills related to network fundamentals, LAN switching technologies, routing technologies, infrastructure services, and infrastructure maintenance.

Last date to test: February 23, 2020
The 100-105 ICND1 exam will be retired on February 23, 2020.

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Latest updates Cisco 100-105 exam practice questions

Which two configuration steps will prevent an unauthorized PC from accessing the corporate network? (Choose two.)
A. set the port security aging time to 0
B. create the port as a protected port and statically assign the MAC address to the address table
C. configure the switch to discover new MAC addresses after a set time of inactivity
D. enable port security on the switch
E. create the port as an access port and statically assign the MAC address to the address table
Correct Answer: DE

Refer to the exhibit. If the router Cisco returns the given output and has not had its router ID set manually, what value
will OSPF use as its router ID?lead4pass 100-105 exam question q2

Correct Answer: D

From which of the following attacks can Message Authentication Code (MAC) shield your network?
A. DoS
C. spoofing
D. SYN floods
Correct Answer: C
Message Authentication Code (MAC) can shield your network from spoofing attacks. Spoofing, also known as
masquerading, is a popular trick in which an attacker intercepts a network packet, replaces the source address of the
packets header with the address of the authorized host, and reinserts fake information which is sent to the receiver. This
type of attack involves modifying packet contents. MAC can prevent this type of attack and ensure data integrity by
ensuring that no data has changed. MAC also protects against frequency analysis, sequence manipulation, and
ciphertext-only attacks. MAC is a secure message digest that requires a secret key shared by the sender and receiver,
making it impossible for sniffers to change both the data and the MAC as the receiver can detect the changes. A denial-
of-service (DoS) attack floods the target system with unwanted requests, causing the loss of service to users. One form
of this attack generates a flood of packets requesting a TCP connection with the target, tying up all resources and
making the target unable to service other requests. MAC does not prevent DoS attacks. Stateful packet filtering is the
most common defense against a DoS attack. A Distributed Denial of Service attack (DDoS) occurs when multiple
systems are used to flood the network and tax the resources of the target system. Various intrusion detection systems,
utilizing stateful packet filtering, can protect against DDoS attacks. In a SYN flood attack, the attacker floods the target
with spoofed IP packets and causes it to either freeze or crash. A SYN flood attack is a type of denial of service attack
that exploits the buffers of a device that accept incoming connections and therefore cannot be prevented by MAC.
Common defenses against a SYN flood attack include filtering, reducing the SYN-RECEIVED timer, and implementing
SYN cache or SYN cookies.

Which three statements about IPv6 address fd14:920b:f83d:4079::/64 are true? (Choose three)
A. The subnet ID is 14920bf83d
B. The subnet ID is 4079
C. The global ID is 14920bf83d
D. The address is a link-local address
E. The global ID is 4079
F. The address is a unique local address
Correct Answer: BCF

This topology contains 3 routers and 1 switch. Complete the topology.
Drag the appropriate device icons to the labeled Device
Drag the appropriate connections to the locations labeled Connections.
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Drag the appropriate IP addresses to the locations labeled IP address
(Hint: use the given host addresses and Main router information)
To remove a device or connection, drag it away from the topology.
Use information gathered from the Main router to complete the configuration of any additional routers.
No passwords are required to access the Main router. The config terminal command has been disabled for the HQ
router. The router does not require any configuration.lead4pass 100-105 exam question q5

Configure each additional router with the following:
Configure the interfaces with the correct IP address and enable the interfaces.
Set the password to allow console access to consolepw
Set the password to allow telnet access to telnetpw
Set the password to allow privilege mode access to privpw
Not E: Because routes are not being added to the configurations, you will not be able to ping through the internetwork.
All devices have cable autosensing capabilities disabled.
All hosts are PC\\’s
Correct Answer:
Answer: Specify appropriate devices and drag them on the “Device” boxes For the device at the bottom-right box, we
notice that it has 2 interfaces Fa0/2 and Fa0/4; moreover the link connects the PC on the right with the device on the
bottom-right is a straight-through link -> it is a switch
The question stated that this topology contains 3 routers and 1 switch -> two other devices are routers Place them on
appropriate locations as following:
(Host D and host E will be automatically added after placing two routers. Click on them to access neighboring routers)
Specify appropriate connections between these devices:
+ The router on the left is connected with the Main router through FastEthernet interfaces: use a crossover cable
+ The router on the right is connected with the Main router through Serial interfaces: use a serial cable
+ The router on the right and the Switch: use a straight-through cable
+ The router on the left and the computer: use a crossover cable (To remember which type of cable you should use,
follow these tips:
-To connect two serial interfaces of 2 routers we use serial cable
-To specify when we use crossover cable or straight-through cable, we should remember:
Group 1: Router, Host, Server
Group 2: Hub, Switch
One device in group 1 + One device in group 2: use straight-through cable
Two devices in the same group: use crossover cable
For example, we use straight-through cable to connect switch to router, switch to host, hub to host, hub to server… and
we use crossover cable to connect switch to switch, switch to hub, router to router, host to host.)
Assign appropriate IP addresses for interfaces:
From Main router, use show running-config command. (Notice that you may see different IP addresses in the real CCNA
exam, the ones shown above are just used for demonstration)
From the output we learned that the ip address of Fa0/0 interface of the Main router is This
address belongs to a subnetwork which has:
Increment: 16 (/28 = or 1111 1111.1111 1111.1111 1111.1111 0000) Network address: (because 176 = 16 * 11 and 176 and assign it to the Fa0/0 interface the router on the left Use the same method for interface Serial0/0
with an ip address of Increment: 16 Network address: (because 160 = 16 * 10 and
160 and we choose for Serial0/0 interface of the router on the right Interface Fa0/1 of the router on
the left IP (of the computer on the left) : Increment: 16 Network address: (because
128 = 16 * 8 and 128 we choose from the list Interface Fa0/0 of the router on the right IP (of the
computer on the left) : Increment: 16 Network address: (because 224 = 16 * 14
and 224 we choose from the list Let\\’s have a look at the picture below to summarize Configure two
routers on the left and right with these commands: Router1 = router on the left Assign appropriate IP addresses to Fa0/0
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and Fa0/1 interfaces:
Router1#configure terminal
Router1(config)#interface fa0/0
Router1(config-if)#ip address
Router1(config-if)#no shutdown
Router1(config-if)#interface fa0/1
Router1(config-if)#ip address
Router1(config-if)#no shutdown Set passwords (configure on two routers)
+ Console password:
Router1(config)#line console 0
Router1(config-line)#password consolepw
+ Telnet password:
Router1(config)#line vty 0 4
Router1(config-line)#password telnetpw
+ Privilege mode password:
Router1(config)#enable password privpw Save the configuration:
Router1#copy running-config startup-config Configure IP addresses of Router2 (router on the right) Router2>enable
Router2#configure terminal
Router2(config)#interface fa0/0
Router2(config-if)#ip address
Router2(config-if)#no shutdown
Router2(config-if)#interface serial0/0
Router2(config-if)#ip address
Router2(config-if)#no shutdown
Then set the console, telnet and privilege mode passwords for Router2 as we did for Router1, remember to save the
configuration when you finished.

Which two attributes of a packet change at every router along the path from source to destination? (Choose two.)
A. destination IP address
B. source MAC address
C. packet MTU
D. source IP address
E. destination MAC address
Correct Answer: BE

Which form of NAT maps multiple private IP addresses to a single registered IP address by using different ports?
A. static NAT
B. dynamic NAT
C. overloading
D. overlapping
E. port loading
Correct Answer: C

Which IP addresses are valid for hosts belonging to the subnet? (Choose three.)
Correct Answer: ACD
All IP address in IP ranges between: and are valid as shown below Address:
00001010.00000001.1010 0000.00000000 Netmask: = 2011111111.11111111.1111 0000.00000000
Wildcard: 1111.11111111 Which implies that Network:
00001010.00000001.1010 0000.00000000 HostMin: 0000.00000001
HostMax: 1111.11111110 Broadcast:

Which statements describe the routing protocol OSPF? (Choose three)
A. It supports VLSM.
B. It is used to route between autonomous systems.
C. It confines network instability to one area of the network.
D. It increases routing overhead on the network.
E. It allows extensive control of routing updates.
F. It is simpler to configure than RIP v2.
Correct Answer: ACE
The OSPF protocol is based on link-state technology, which is a departure from the Bellman-Ford vector based
algorithms used in traditional Internet routing protocols such as RIP. OSPF has introduced new concepts such as
of routing updates, Variable Length Subnet Masks (VLSM), route summarization, and so forth.
OSPF uses flooding to exchange link-state updates between routers. Any change in routing information is flooded to all
routers in the network. Areas are introduced to put a boundary on the explosion of link-state updates. Flooding and
calculation of the Dijkstra algorithm on a router is limited to changes within an area.

Which configuration must you perform to enable VTP in a switching domain?
A. Configure a switch as a client.
B. Configure a switch with a VTP domain.
C. Configure a switch with VTP mode off to serve as the server switch.
D. Configure a switch in transparent mode.
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Correct Answer: B

Which port security violation mode allows traffic from valid mac address to pass but block traffic from invalid mac
A. protect
B. shutdown
C. shutdown vlan
D. restrict
Correct Answer: A

All protocols on a network are using their default administrative distances with no redistribution. In which two different
ways can you modify them so that OSPF and RIPv2 learned routes are preferred over EIGRP-learned routes? (Choose
A. Change the OSPF administrative distance to 5.
B. Change the RIP administrative distance to 70.
C. Change the EIGRP administrative distance to 70.
D. Change the RIP administrative distance to 100.
E. Change the EIGRP administrative distance to 100.
Correct Answer: AB

How are MAC addresses removed from a MAC address table?
A. They are removed automatically if they remain inactive for the duration of the switch aging timer.
B. They are removed automatically on a FIFO basis when the address-table limit has been reached.
C. They must be manually cleared from the table.
D. They are removed automatically if they remain inactive for the duration of the global MAC address timer.
Correct Answer: D

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Vendor: Cisco
Certifications: ICND1
Exam Name: Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)
Exam Code: 100-105
Total Questions: 332 Q&As
100-105 dumps
What is one requirement for interfaces to run IPv6?
A. An IPv6 address must be configured on the interface.
B. An IPv4 address must be configured.
C. Stateless autoconfiguration must be enabled after enabling IPv6 on the interface.
D. IPv6 must be enabled with the ipv6 enable command in global configuration mode.
Correct Answer: A

Some routers have been configured with default routes. What are some of the advantages of using default routes? (Choose two)
A. They establish routes that will never go down.
B. They keep routing tables small.
C. They require a great deal of CPU power.
D. They allow connectivity to remote networks that are not in the routing table
E. They direct traffic from the internet into corporate networks.
Correct Answer: BD

Which two of these statements are true of IPv6 address representation? 100-105 dumps (Choose two.)
A. There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.
B. A single interface may be assigned multiple IPv6 addresses of any type.
C. Every IPv6 interface contains at least one loopback address.
D. The first 64 bits represent the dynamically created interface ID.
E. Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.
Correct Answer: BC

Which option is the default switch port port-security violation mode?
A. shutdown
B. protect
C. shutdown vlan
D. restrict
Correct Answer: A

Refer to the exhibit.
100-105 dumps
A user cannot reach any web sites on the Internet, but others in the department are not having a problem.
What is the most likely cause of the problem?
A. IP routing is not enabled.
B. The default gateway is not in the same subnet.
C. A DNS server address is not reachable by the PC.
D. A DHCP server address is not reachable by the PC.
E. NAT has not been configured on the router that connects to the Internet.
Correct Answer: C

ROUTER# show ip route is variably subnetted, 9 subnets, 3 masks
C /28 is directly connected, Loopback1
C /28 is directly connected, Ethernet0
C /28 is directly connected, Loopback0
O /30 [110/128] via, 00:35:36, Serial0C /30 is directly connected, Serial0 O /30 [110/782] via, 00:35:36, Serial0
O /30 [110/128] via, 00:35:36, Serial0
O /30 [110/782] via, 00:35:37, Serial0
O /30 [110/782] via, 00:35:37, Serial0
O [110/128] via, 00:35:36, Serial 0
To what does the 128 refer to in the router output above?
A. OSPF cost
B. OSPF priority
C. OSPF hop count
D. OSPF ID number
E. OSPF administrative distance
Correct Answer: A

Which route source code represents the routing protocol with a default administrative distance of 90 in the routing table? 100-105 dumps
A. S
B. E
C. D
D. R
E. O
Correct Answer: C

Refer to the exhibit.
100-105 dumps
A problem with network connectivity has been observed. It is suspected that the cable connected to switch port Fa0/9 on Switch1 is disconnected. What would be an effect of this cable being disconnected?
A. Host B would not be able to access the server in VLAN9 until the cable is reconnected.
B. Communication between VLAN3 and the other VLANs would be disabled.
C. The transfer of files from Host B to the server in VLAN9 would be significantly slower.
D. For less than a minute, Host B would not be able to access the server in VLAN9. Then normal network function would resume.
Correct Answer: D

Which method does a connected trunk port use to tag VLAN traffic?
A. IEEE 802 1w
B. IEEE 802 1D
C. IEEE 802 1Q
D. IEEE 802 1p
Correct Answer: C

Which destination IP address can a host use to send one message to multiple devices across different subnets?
Correct Answer: D

A receiving host has failed to receive all of the segments that it should acknowledge. 100-105 dumps What can the host do to improve the reliability of this communication session?
A. decrease the window size
B. use a different source port for the session
C. decrease the sequence number
D. obtain a new IP address from the DHCP server
E. start a new session using UDP
Correct Answer: A

Why would a network administrator configure port security on a switch?
A. to prevent unauthorized Telnet access to a switch port
B. to prevent unauthorized hosts from accessing the LAN
C. to limit the number of Layer 2 broadcasts on a particular switch port
D. block unauthorized access to the switch management interfaces
Correct Answer: B

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