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—122 HosttoHost Packet Delivery (14 of 22) 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —123 HosttoHost Packet Delivery (15 of 22) 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —124 HosttoHost Packet Delivery (16 of 22) 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —125 HosttoHost Packet Delivery (17 of 22) 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —126 HosttoHost Packet Delivery (18 of 22) 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —127 HosttoHost Packet Delivery (19 of 22) 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —128 HosttoHost Packet Delivery (20 of 22) 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —129 HosttoHost Packet Delivery (21 of 22) 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —130 HosttoHost Packet Delivery (22 of 22) 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —131 Default Gateway 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —132 HostBased Tools: ping 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —134 HostBased Tools: Table 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —135 HostBased Tools: tracert 169。 2023 Cisco Systems, Inc. All rights reserved. ICND1 —137 Summary ? Layer 1 provides the physical media and its encoding