The block 192.168.5.0/24 is split into four equal subnets. What is the network address of the third subnet?
A. 192.168.5.64/26
B. 192.168.5.96/27
C. 192.168.5.128/26
D. 192.168.5.192/26
Show answer and reasoning
Correct answer: C. 192.168.5.128/26
Correct. Four equal subnets from a /24 require 2 borrowed bits, giving /26 with a block size of 64. The subnets are .0, .64, .128 and .192, so the third is 192.168.5.128/26. Source: 200-301 topic 1.6; RFC 950 subnetting procedure.
- A: 192.168.5.64/26 is the second subnet. The four /26 blocks start at .0, .64, .128 and .192.
- B: 192.168.5.96 is a /27 boundary; splitting a /24 into four parts gives /26 blocks, not /27.
- D: 192.168.5.192/26 is the fourth and last subnet, not the third.
Source: 200-301 1.6
A technician plans to assign hosts in the subnet 192.168.1.8/29. Which of these addresses cannot be assigned to a host?
A. 192.168.1.9
B. 192.168.1.12
C. 192.168.1.14
D. 192.168.1.15
Show answer and reasoning
Correct answer: D. 192.168.1.15
Correct. A /29 has a block size of 8, so the subnet runs .8 to .15 and .15 is the broadcast address, which cannot be assigned to a host. Source: 200-301 topic 1.6; RFC 950 subnetting procedure.
- A: 192.168.1.9 is the first usable host in the block .8 to .15.
- B: 192.168.1.12 is a valid host address in the block .8 to .15.
- C: 192.168.1.14 is the last usable host in the block .8 to .15.
Source: 200-301 1.6
Which pairing of channel-group modes on opposite ends of a link successfully negotiates a PAgP EtherChannel?
A. active and passive
B. desirable and auto
C. on and active
D. auto and auto
Show answer and reasoning
Correct answer: B. desirable and auto
Correct. PAgP desirable actively negotiates and auto responds, so desirable with auto (or desirable with desirable) forms a PAgP EtherChannel. Source: 200-301 topic 2.4; Cisco Catalyst configuration guide, EtherChannel PAgP modes.
- A: active and passive are LACP modes and would negotiate LACP, not PAgP.
- C: on disables negotiation, and active is LACP; combining them produces no working channel.
- D: auto on both ends never initiates negotiation, so no channel forms.
Source: 200-301 2.4
In the entry S 10.50.0.0/16 [1/0] via 192.168.100.2, what is 192.168.100.2?
A. The router's own interface address
B. The next-hop address to which packets for 10.50.0.0/16 are forwarded
C. The destination network
D. The address of the DHCP server
Show answer and reasoning
Correct answer: B. The next-hop address to which packets for 10.50.0.0/16 are forwarded
Correct. The address after via is the next hop, the neighbouring router's interface that receives packets matching this route. Source: 200-301 topic 3.1.d; Cisco IOS command reference, show ip route field descriptions.
- A: The router's own addresses appear in C and L entries, not after via.
- C: The destination network is 10.50.0.0/16, before the brackets.
- D: DHCP servers are not recorded in the routing table.
Source: 200-301 3.1.d
In the routing table entry D 10.2.0.0/16 [90/30720] via 10.1.1.2, what does the number 90 represent?
A. The EIGRP metric
B. The administrative distance
C. The hop count
D. The age of the route in seconds
Show answer and reasoning
Correct answer: B. The administrative distance
Correct. The first number in the brackets is the administrative distance, and 90 is the default AD for internal EIGRP routes. Source: 200-301 topic 3.1.e; Cisco IOS IP Routing Configuration Guide, administrative distance table.
- A: The EIGRP metric is the second number in the brackets, 30720.
- C: EIGRP does not use hop count as its metric; RIP does.
- D: Route age is shown as a timestamp after the next hop, not inside the brackets.
Source: 200-301 3.1.e
